Do I have social anxiety disorder?

Maybe a little. But being fearful of doing something stupid or not like being the center of attention or hate giving presentations is pretty normal. The thing that sticks out to me is that you can't make eye contact with anyone other then your friends/family and that you feel like you're being watched, which sounds like your paranoid sometimes. Yeah so I'm not a doctor or anything, but it does sound like you sometimes have a lot of anxiety so maybe you do have social anxiety.