Struggling with a Possible Autism Diagnosis

Hi, I have recently discovered that I have quite a few symptoms for autism and I’m not exactly sure what to do? My grandpa has Asperger’s and I heard it’s genetic? If I do actually have autism and it’s not just my adhd or anxiety then I really don’t have anyone to support me. My mother is super conservative and she has a personality disorder (I think, my brother mentioned it but it’s supposed to be a secret?) so she kinda does some interesting things like get really into these theory’s and stuff and one of them is that autism is only because of vaccines and radiation and doctors poisoning us or something so if I talk to her about that then she will for sure get mad at me. Lately I have been stimming a lot ( repetitive or “unusual”movements or noises that happen in overwhelming situations - by googles definition) the stimming hasn’t really been getting in the way but other things are. I am a really picky eater, I’m talking like I hardly eat anything sometimes because of it. It’s been really getting In the way. I’ve gotten into fights with my parents because I won’t eat meals if I “can’t” eat the food options I am given. I hate it so much. I also have other symptoms but they aren’t as severe. Anyway I don’t know if I actually do have autism, it is just a speculation but idk how to cope.