I am scared of older adults, I feel intimidated ?

I am 22 years old, with ASD I have been experienced getting bullied and being intimidated by older adults. 

I keep having a lot of older women giving me dirty looks and I had ones who have been saying really nasty things about me. 

I had ones who treated me differently than other adults. 

I am scared especially on the road when im driving, I dont care if people beep at me but I had one incident today, the guy parked his vehicle where you pump your tyres, as I let this other guy go I drove into the parking space but when before I parked he deeped at me and then after I parked up to wait for my mum his wife got out of the car and I was felt reallt scared she said to me " we were waiting" i said to " i didn't know I am really sorry" at this petrol station I know this place well and the staff too and the lady just walked off and the way I said sorry i was panicking because I was scared if she was going to be nasty, then I cried and as she came out the petrol station she saw me crying because I was scared and she gave me a dirty look.  We make mistakes, I always look around my surroundings and I never been that disrespectful and I thought he was parked up. I always got been told that don't driving get you down. 

I am scared of older adults and I feel like they are bullies.