A temporary fix-
Find a new hobby. It has to be completely new, and it has to be something you might feel excited about (especially if you succeed in it) . Then go out and buy your materials. Learn and build, (or whatever) and post the results to your friends. It might not be as great as it should be, but perhaps you will feel a tinge of pride.

I've done:
A couple video projects
Chainmail armor
Pumpkin carving
Crocheting
Storywriting
Video games (really, it helps)