Support for friends

Hi

I'm completely new to this and need some advice - basically people just don't get me. I am an adult and was diagnosed with autism and dyspraxia as an adult as I returned to university.

There is a lot of support out there it appears for families but my family has given up on me and the 'family' I have are my friends (well one sided friendship because I can't meet them at the same level). They get very frustrated with me and say they're trying to 'teach' me how to be in their world and respond the way they expect me to be. For example I was with a friend yesterday and she asked me if I am free on Wednesday and did I want to go to her house. I answered Yes I am free, yes I wanted to go to her house. What is wrong with my answer because she blew up and told me 'wrong answer' and get really angry. 

It is so frustrating and I don't know what to do. Or how to help them.

Any advice?