Venting again oops

I’ve talked about this subject before online but the fact that once my parents pass I’ll be alone is really scaring me. I don’t have siblings, no cousins that I’m close to. All of the other people in my life that I’m close to like godmothers are much older than myself as well. It’s not fair. I don’t even have friends that I’m 100% certain will always be around. I’m really gonna be out here on my own and as an autistic & disabled person I don’t know if I can handle that.