I find it very hard to believe you're being avoided solely on your looks. I had WAY messed up teeth/jaws and still managed to be social with as many friends as I have now even after my smile is fixed. I was also married before I had any jaw/dental work done. Why is that? Because I could see past my own flaws and I didn't let it stop me from going out, having friends, having a boyfriend, etc. I mean this in the nicest way possible, but sometimes people who sit at home and say "poor me, I am so ugly," (when, like in your case, they absolutely are not ugly) are actually bringing your isolation on yourself. You work this notion in to your head that you're a hideous person and you start shrinking back in to lonely self loathing mode and then think it's everybody else avoiding you when in fact it's that you've shrunk back and it's YOU avoiding everybody else.
You're fine. I wouldn't do something drastic like jaw surgery to fix what problems you think you might have. Chances are it's not going to be the fix all you're looking for and these issues run much deeper than that. You need to learn to love you for you now. If you do that and get some confidence back, I am willing to bet your social life and everything else will seen an uptick again.