I've been in a... similar position.
I developed an eating disorder, left uni (hated the end of the course, would have been ejected on health grounds, etc), lost most of my friends due to social sides of the brain shrinking with that sorta thing, etc. I became... not depressed, but sad. Very sad. Also I suffered from anxiety. >__>' Good times.
But planning helps. Plan what you want to do with your life. Don't know what to do? Look at what gives you a little buzz. From art to writing to cooking to computer programming, etc.
Next plan how you will achieve that. Do stuff in the middle. Do things you enjoy. Find people on the same level. As senator88 said, explore! Join clubs, societies, groups, gaggles (of geese?)...
But you must realise that any change won't happen magically, you have to make it happen. If you need to talk, talk. Talk till your mouth goes numb, but please, you have to get the drive to make your OWN life better.