Life is frightening - there' a big wide world out there, and you don't know what to do about it. Well, for a start, you don't have to pigeon-hole yourself to one thing, so, have you any idea, without going off into the realms of fantasy, what you might like? A career? A homelife and family? Talk to the careers officer at school this will give you basic options , study, college, university etc. You can always change. Peope do all the time. You might want to travel.
Playing computer games isn't keeping depression at bay, you are not depressed, just...unenlightened! We all have dreams, hopes, we just all need a little help to start to achieve them..