Infantilization

Im just wondering if anyone else has had the same experience as me. Im not openly out, but i make no effort to hide the fact that I don't really feel or care about sex as a whole. A few of my friends have clocked it and I think my coworkers have too in a way. But every time the subject pops up they talk about it as if I'm a kid who can't understand it/ shouldn't know about it. Im 22, i know what sex is. Also i think it affects the way people see me, since sex is a social benchmark of maturity. And since I have no interest and a slight dislike for sexual content, therefore they subconsciously treat me as if I am younger than I am. Im not good at explaining things, just thought id put this out there.