I think I've outgrown my friends and I don't know what to do?

Common thing to do when you get into your early twenties and you may be a couple of years ahead of your circle of friends who still want to party. I certainly did at around age 21–22. I just moved far enough away to where I only saw them when I was “in town”. I still know most of them even in middle age. Most of them will grow out of it, some never will. You are at a critical age, you want to still have fun but you do want to remove the negative influences in your life that are dragging you down and keeping you away from your goals. How to approach them? It’s up to you but The easiest thing to do is simply be busy with more important things like establishing a career or going to school. If they truly are your friends they will understand. If not then they are not really friends. You can still hang out with them when you feel like it and you should at times once you gigure out who your real friends are. Just not when it’s bringing you down.

Limiting yourself to those 3 subsets of type of friends sounds exhausting…try and find that 4th group of friends who are funny, adventurous who just like to have a good time hanging out. You will have nothing to complain about when you do.

It doesn’t sound like you’re in conflict with them so you don’t really need to cut them off.
It seems to me you might just need to cultivate some new activities/hobbies/commitments that you are genuinely interested in and that could serve as the ‘excuse’ to spend less time with those people.
Wean them off your company gently,keep in touch but on your own terms, if for no other reason than you may need their friendship more at some time in the future.

I would advise you not to tell your friends that you’ve outgrown them – that is too hurtful a thing to say. You can say you need a little more space, that you are exploring new parts of yourself and need some more alone time. And the idea of weaning yourself off them that @dabbler advises sounds good to me.

You owe no one an apology for growing up. You’re fondness for your friends is laudable. The day will hopefully come when they get it. Keep in touch but move on.

It happens to everyone. We eventually all find a path we want to go and sometimes it’s not going to involve traveling with the same companions. It’s your life, do what you need to do to find your own happiness.
As for the depression, I just read an article about the benefits of going out to the woods or someplace tranquil and secluded for people with depression. They found that even just taking daily walks alone out in nature helped them significantly. This article isn’t the same one I read but close enough. http://news.stanford.edu/2015/06/30/hiking-mental-health-063015/

Go outside by yourself. Sign up for new activities you want to do, and hang out with them less. Make new friends, etc.

Oh, and stop identifying yourself as having the problems you don’t want in your friends. Seek counseling/support for that as needed.

Be patient and relax. Soon you will have new, different friends. Life goes on!

In the past I had a variety of friends. I often used to think if I put them in a room together would they actually get on? Probably no and the reason is that, I have many diverse ‘selves’. We all do. For each of those parts of me I had friends and each visit was special. I had my dear gay guy friends who made me laugh and heard me cry, I had best girl friends, I had intellectual type friends and so on. One thing I have learned is always diversify. Much like investing really.

I never really ‘dumped’ a friend. I just saw less and less of them.

They don’t sound that negative, these days I’d love to go and sit and chat and have pizza with some like-minded people. Perhaps you are projecting your own depressions onto them?

Anyway, it’s always okay to move on, or to move around, so to speak.

Unfortunately (although sometimes fortunately) friends come and go. Most of us maintain a couple of core friendships that may last a lifetime but the vast majority of people we come to consider friends flow into and out of our lives much like the water that flows around and over the boulder in mid-stream.
I suggest you live your life the way you must, enjoy the friendship of those who are now in that flow while cultivating other relationships that suit your present state. Eventually you will move on, or they will, and you will find yourself in a new current.
And should at some time in the future you find yourselves back in touch, enjoy each others company while you can and reflect on the good times you had together back in the day.

You say that your current group of friends is depressed and later on you say that you are trying to battle against depression and find that your friends are reinforcing one another’s depression. If this is the case then you are correct to say that you are in a toxic situation and need to get out. I see no reason why you can’t explain yourself to your friends. Tell them how much you like them, but your views have changed and you need to part ways. You might also want to see if you can find a local depression support group. A good support group does not become a pity party but offers support for those coping with depression and can give advice about therapy and other ways of at least alleviating the symptoms.

You became friends because, as you’ve already mentioned, you had a lot in common. Now, your interests changed, so there is a very little chance you’ll save your friendship. Nevertheless, you should try. If your mates appreciate you, they’ll understand your choice to improve your life and it will not influence the tight emotional connection between you. Ghosting out for a week is not so critical, if you explain to the friends your wish to stay alone for some time. Everyone would be confused in the situation as yours. So it’s normal to ask for some space. But your silence can be taken wrongly. You delay face-to-face meeting for obvious reasons but your friends don’t see the big picture and can make wrong conclusions finding ignoring as a refusal to maintain good relationships. Don’t miss an opportunity to fix the situation. Muster up your courage and face your friends. If you like them for real, your internal changes will not impede you to stay a part of their world. The right thing to do is not to leave these people behind but to reconcile new and old of you.