I have social anxiety disorder where social situations cause me stress and it's hard to function out in public sometimes.
Have you gone to a therapist who is able to help you with that? 
I've thought about it, but for now I'm trying to self medicate. When I'm out, I make sure I have plenty to drink (alcohol)
It's always good to be able to loosen up when in public, but it might not be the best long term solution. Why do you think you have such an issue in public settings?
I think it's because in my head, I think everyone is judging me. I just start to sweat and I get sick in my stomach. 
I can relate to that, especially when it comes to meeting new people. Do you feel more comfortable once you get to know people?
Usually, but it takes awhile for me to do that. SAD is sometimes called the "illness of lost opportunities" Boy, that sure is accurate.