I have a terrible fear of loosing control and inhibitions.  I’ve been drunk plenary of times and it was pleasant some times, but a few times were terrible (the spins, vomiting, bad hangovers).  

I’m 26 and never drink at parties, family events, etc. because I’m so anxious that drinking one or two beers will make me feel “drunk” and I’ll be out of control.  People assume I’m sober or have some religions reason why I don’t drink.

Fact is, I want to.  But I’m too anxious.  I’ve been able recently to nurse 1/2 a beer and stop.  How can I overcome this?