Lowkey need help

Hey everyone! So, recently I've been thinking to myself, and I think I may have Autism. I have multiple family members with it so it's not like I'm new to it or if I do have it, I'm completely lost. The thing is I don't know how to bring it up to my family and if I need to ask my doctor about it. Ever since I was young, I've always felt... different. How I interacted and socialized with others just felt like I had to try harder to express myself but in a way that didn't harm anyone's feelings. I occasionally stim by rocking back and forth, scratching my head, sticking my tongue out a tiny bit, and rubbing my hands together, but I never thought much of it until now. I always thought it was just one of those weird things people do sometimes like tapping a foot or something. I was always pretty smart and had good grades, but when it came to people, I was more lost. I either took things to literally or I couldn't comprehend certain concepts. I've been told multiples times that I'm rather bland and that I have a resting bitch face and it's just stuff I've noticed ig.  I tend to overthink a lot and when I was younger, I had a hard time speaking clearly which seems to be a common factor in my family for people who have autism. I guess I'm just writing this to get my thoughts out and to know if maybe I'm just jumping to stuff or not. Any of you guys going through something similar or nah?