I'm Afraid That I'll Be Single Forever

I'm damaged goods, I know that sounds weird, I'm only 18, but I'm damaged goods. Today I grabbed my mum's arm, quite hard... I didn't mean to but she touched my leg, I wasn't expecting it so I reacted. I was with a girl in a club a couple of weeks ago, and we were having a good time, but she stroked my side and I pushed her off of me, I just freak sometimes! How do you have a relationship when you won't let the person touch you? I am happy to cuddle when I control it and can touch people and do stuff, but won't let them do stuff to me or touch me, I just can't! I feel too vulnerable maybe? I'm sensitive to touch anyways because I have aspergers syndrome (part of autism) and have an oversensitive nervous system (it's complicated) but all in all I have 6 medical condition's not including anxiety and bi-polar, which I also have! That's baggage no-one will ever be interested in carrying! I manage one night stands but never manage to get further, I don't want to be single forever but I guess that's just how the cookie crumbles.