I feel the same way... although it's only been a short time compared to a lot on this board (2 1/2 years), I feel like a lot of that has been wasted... there's nothing I can look back at and think, yes I'd love to do that again because I spend every day trying to just 'get by' and cope.
I keep trying to get myself to be more social (but it's really hard for me)... maybe you should do that too?
Hardest part for me is knowing that those two and a half years have been what's supposed to be some crucial years in my academic and social life (end of college/beginning of university)

Try and think of something you enjoy doing... anything? Do you work? Try and pursue a life long dream maybe (if it's possible)... I've always loved musical theatre since a young age but unfortunately don't have a good singing voice, so I've recently decided I'm going to learn to dance, not sure when I'll get enough courage to start but I'm trying

Hope I've helped a bit
take care

Molly