I have high functioning Autism as well and even Asperger's like Pamperslover.
I get very uncomfortable when around too large of a crowd and mostly prefer to be alone.
My Asperger's used to be worse as a kid but I've become more comfortable as an adult talking to some people and being around some people.
As a kid I would always be uncomfortable at family gatherings and still am today although it's not as bad as it used to be.
I remember as a kid I would always go hide in my room or somewhere else when family came over to visit.
I can remember being 2 years old and hiding behind my dad or mom when someone would come over or when we went to their house and I couldn't get away.
Even now I look out the windows and door to see if people are around before I leave the house.
It's been that way since I was a kid too.
I also have phone anxiety where if I need to call someone on the phone or talk to them and I don't know them my heart starts beating fast until I get off the phone.