Do you talk too much? Do you not listen? This bothers me about people.
I have the same problem as you described. Forget going to a bar and adding alchohol to the mix! I think I'm dorky and insecure and I make fun of people and say the wrong things so I know why people don't like me. I feel defective. It's their loss because when I do get comfortable, I'm the best friend you'll ever have.