What are some key points to maturing?

Short fuse? Take a deep breath or a lot of deepbreaths, if necessary, before you say anything.
High expectations? Get real. Let yourself be surprised when things turn out better than you expected.
Lust? I hear cold showers are good and lots of physical exercise like running or swimming.
As years go by, you’ll mature. It’s a good thing to do, but keep some of that youthful enthusiasm forever, if you can.

Learn the art of reframing:

http://en.wikipedia.org/wiki/Cognitive_reframing

Make sure your short fuse is not based on a pool of stored rage. If it is consider working with a therapist to defuse it. You need to experience it and move on so that it doesn’t leak into other aspects of your life.

There is noting wrong with high expectations. Just set (and write down) realistic goals and the steps you plan to take to achieve them.

If you are a young man (and I take it you are) being lustful is your natural state. But you don’t have to act on that.

Embrace Self-Loathing.
Recognize what a rotten person you are.
Look how you have failed to live up to your potential.
Detail your sinful ways.
We all fall short. We deserve nothing.

Once you see that, you no longer will feel the short fuse, since you acknowledge your own disappointments. You will no longer feel lustful, because who would have you? You won’t worry about high expectations, because you know reality.
Do your best, be a good person, and try to overcome your own flaws. Embrace your own faults, land the pressure will be off.

Really realize that you can’t change other people. This is a lifelong learning process.

@mattbrowne…excellent advise! Takes a lot of practice but you’re happier if you make reframing goal in each stressful situation. Someone once told me “There’s always some poor ba&#rd on the bottom!”

Short fuse: Remember that life is way too short to be pissed about every little thing and being pissed off doesn’t solve a single thing. More than likely it does more damage to yourself than the person it is directed too.

High Expectations: Will always lead to disappointment and frustration. Especially when directed to others. Learn to embrace peoples differences and value that some of their ideas may be gems in disguise. Even a fool can come up with a valuable idea from time to time.
Now if the expectations are from yourself, then you will be in constant frustration mode. You can not lie to yourself and no one is perfect. So do your best and hope it works out. Most people with high expectations of themselves feel they must surpass what others think of them. Don’t be what you are not. Be who you are.

Lustful: Not sure if you mean sexually or lustful for everything around you. If it is sexually and you want to stop sleeping around then nothing works better than going on the web and researching lots of pictures of venereal diseases. Keep those pictures in your mind the next time you are attracted to someone. Remember the prettier they are the more likely that they may have had tons of sexual encounters and may be a carrier. Rubbers are not 100%. If its with a partner than no worries. Time will temper the lust.

Now if it is for food or things that you lust, then remember that too much of anything takes you away from living your life. When you want to go shopping and purchase tons of food, remember that most will end up in the trash. When you buy tons of expensive furniture, remember by buying only what you need you will have money to go out and enjoy things. Go out to shows, dinner, vacations. Hard to do all this things if your health starts to suffer from overeating or you have to work too many hours to even enjoy your expensive things.

Bottom line. To control the things you do not like, you must see them from a different perspective and don’t blame the behavior. It doesn’t make you do anything. You chose to do it.
It becomes a habit because you wanted it to be. Same way you wanted it at first is the same way you can make it disappear. For this to work it has to be a real desire on your part.