Looking young

I'm 21 which I'll admit is a bit young but that's not the problem. Everyone in my family has a tendency to look younger than we are. Someone literally asked me how middle school was going last year and I nearly choked on my water. Another person guessed I was around 13 and I nearly slapped him. Anyway, I know I'm going to be judged and ridiculed and talked about whenever o take my child out in public. I know because when I was pushin my niece around in Disney when I WAS 16 I saw people shaking their heads and making comments about me. Anyway I'm not married and I'm not planning on it  any time soon. I just wish I knew I would be respected and not ridiculed for keeping my child.