It sounds like I have the same problem you do? Being 24, I was at the end of my ropes, went into a major depression, and became an alcoholic.
So I was looking up antidepressants and read about zoloft being an antidepressant and also used for social anxiety disorder.
I took an online self report called the social phobia interest inventory (spin). I highly recommend you take it at
edit
found out that I have it, and learned that I was not the only one with it. Matter of fact alot of people are going through the exact same symptoms as you and me.
Social anxiety disorder (aka social phobia) is treatable with counseling and the use of medications.
My friends and I have noticed a difference, I even asked a girl for her number and went out on a date. This has never happened before, plus I am more social too.
Check out this site for more information on social anxiety disorder:
edit
checkout this forum, to read more about people like you and me:edit
and please even if you dont have it, spread the word about social anxiety disorder to others who havent been on a date, kissed a girl, and are suffering. It is the 3rd most common psychological disorder, affects 10% of the population and sadly it is also one the least diagnosed. It took at least 8 years of my life, made it that much harder to succeed and in the end nearly cost me my life too.
Best of luck