Hey I'm an 18 year old female and I know how you feel. I've been dealing with this stuff for about a year and a half or something. Mine is more than just social anxiety though. I know how you feel when you say you feel like you can't create any relationships because you freak out/aren't normal, whatever it happens to be. Ever since I suddenly got this stupid disorder I havn't had much of a social life. I've lost a lot of friends but am still close with the few good ones I had, even though they still don't understand the dynamics of it all. I'm really pissed also because I would love to be out there dating and stuff (and I have a lot of guys in mind) but when it comes down to it I am TERRIFIED. I had a boyfriend when all this start through about a couple months ago so he saw me change and understands but I feel like I would be some huge burden on some new guy. Anyway enough about me! I just had to get that out...
Screamo, a lot of people will tell you to do stupid little exercises like visualizing a comfort spot or blah blah blah you know the drill, but if you really have some type of anxiety disorder, these little exercises aren't much help. They work for "normal" people who every once and a while get scared but an anxiety disorder goes much deeper. I'm not saying this kind of stuff doesn't work though. There is such thing as cognitive behavoir therapy but that is sometimes not enough. I've been taking Zoloft for about 6 months or something and it has really helped. I'm still not taking the full dosage (100 mg) so I still am dealing with this stuff but before I could barely get out of bed in the morning. I highly suggest you going to a psychiatrist because you won't have to be embarrassed when talking about your situation because they deal with that stuff everyday and can suggest techniques and/or prescribe certain medicines. I wouldn't trust a regular doctor prescribing medicine for anxiety and/or depression anyways. I hope this helps!
PS- I am one of those people who "lives inside their head". I've always been kind of an observer instead of a interacter but now that the anxiety hit I have been that more than ever. I am less anxious when I keep to myself. Oh yeah, and you are not crazy, it's just our stupid brains acting up!