I'm taking a psychology class right now. These are some basic things my teacher has told us will help with stress, depression, and what not.
-Get a good nights sleep. Don't stay up really late. Don't drink alcohol or smoke weed before you go to sleep. Some say it helps them sleep, but it really doesn't.
-Eat healthy. Goes without saying much.
-Exercise. Get a gym membership, if you already have one go a little more frequent. When ever I feel stressed or angry, working out always helps.
-Find something to occupy your time. Yes, video games qualify, but other things as well would be great.
-Be social. Go out with some friends to the bars. Go bowling, ride bikes, anything that gets you to be with other people. You must remember, human beings are social creatures.
Hopefully this helps a little. A lot of this should go without saying, but sometimes we need reminders. There also nothing wrong with talking to someone about these issues. Millions of people go through the same things. Your not alone.