find something that motivates you.
I feel quite depressed sometimes too.
I remember when i was about 40 pounds heavier I was always depressed.
I then made it a goal for whatever reason to lose some weight, and here i am, about 8 months later and like 30-40 pounds lighter and much happier.
lose some weight, find a job you'd like to do, go to college, just get out there and live life.
also , stay away from drugs.
they don't really make you happy, trust me i smoked weed quite a few times and contrary to what people say I don't feel as happy as i used to.