It doesn’t sound so much like you are bored, but maybe depressed. If that’s the case, then you should try to seek some help for that. Untreated depression will drag you down and become worse if you don’t deal with it.
I never get bored, although I do occasionally get depressed and I try to deal with it as it happens. There are literally millions of things to do. I would suggest starting with a list. Start with 10 things that you already know you have enjoyed in the past. Then add another 10 things that you have always been curious to try. Then add 10 things to the list that you think might be fun but you might have been afraid to do them alone.
Here are some things that I enjoy doing alone or with a friend or close relative:
Going to the movies. I recently saw Dark Shadows with a group. I loved it so much that I went to see it alone a few days later. AND I ate a big old gnarly plate full of nachos with jalapenos. Something I would never do in front of people I know LOL.
Walking, especially in the mountains along hiking trails, or at the beach or even the local park.
Visiting museums. You’d be surprised at how much cool stuff is inside. Do you have any interest in art, science, history?
Going to see live theater productions. If money is a problem, there are often Jr. Theater productions that are wonderful, in addition, you might be able to get free or discount tickets to regular plays. Go online and see how many theaters (big and small) there are in your town. I don’t recall ever seeing a play I didn’t enjoy. And it’s a completely different experience than watching a movie on TV or even at the theater.
Taking photographs. It’s one of my biggest passions.
Cooking. What do you like to eat? Go online and google stuff you like and find a recipe that sounds tempting. Better yet, find out what one of your nice neighbors likes and make something for them and take it over. Nice neighbors always appreciate little niceties like that.
Do you have any elderly neighbors that could use some help? See if any of them need their lawn mowed or the weeds pulled or if they need you to do a little shopping or house keeping for them. Offer to do it for free.
Organize your photographs. That alone, would keep me busy for a week!
Plan to get together with some of your older relatives and interview them about what life was like when they were your age. Come up with some questions ahead of time. Then write it all down and make copies for all your cousins and aunts and uncles.
Start a craft project. Ever made a mosaic? Built a bird house? Made decorative stepping stones for your yard?
Go for a swim or a bike ride or roller blading.
Write some fan fiction.
Look into taking a class or two. Creative writing, cooking, photography, flower arranging, calligraphy, sign language, tap dancing or whatever appeals to you.
Look into some volunteer work at the local animal shelter, at a retirement home, a plant nursery or farm, offer to clean out someone’s garage. Do something nice for someone else.
Plan a camping trip, even if you just invite a few friends over for a weenie roast and a sleepover in the back yard.
Plan a beach party or a picnic at a local park.
The worst thing you can do is just sit there and wallow in your boredome/down feelings.If you need help with depression, look into getting some help, ask your friends or relatives or a trusted teacher to help you get some help. At least if you do one or more, or even all of the things on this list, there is a chance that you might actually have a good time or do a good deed for someone else. Time is precious, don’t waste it.