How can I regain my sociability?

Back in primary school days I used to have loads of friends and play with them all the time, but by early secondary school I met a whole bunch of new people who were total a**holes. They always seemed to enjoy belittling me, humiliating me in front of others, etc, and nobody wanted to know me. I guess I kinda lost those social skills from childhood along the way somewhere because I moved to a nicer school with nicer people and I just find it difficult to even approach people. Not helped at all by the fact that I have a condition in the autistic spectrum that apparently inhibits social skills. Is there a way to rediscover these old skills?