You can experience success in every moment. We tend to judge ourselves much more harshly than others judge us . . . after all, we know all of our weakness and we also, deep down, know our possibilities.
The first step is to redefine success. If the goal is to meet someone then any step in that direction is a success. If you would like to attend social events but feel uncomfortable then success would be “simply” showing up. Only someone who is shy can understand how difficult it can be to “simply” attend any social function event and how easy it is to not attend.
“Failure” is the natural way to learn so give yourself permission to fail, make mistakes, and even to make a fool of yourself . . . as these are the keys to success.