Is being demisexual actually okay?

So, I'm demi. But I get so much hate for it. Half the time, people think I'm making something up. In fact, I've had people say to me that "being demisexual isn't a real thing", and that I should "stop trying to get attention". The worst thing is when they get it, and then say that it's "such a waste of a pretty body/face". But here's the thing- I have never once felt sexual attraction based on what someone looks like. Sure, I want to be friends, and maybe I'll like them romantically, but the mere thought of being with someone like that makes me sick to my stomach if I'm not already close to them. That's why hookups are so foreign to me. But with someone like my best friend, who I've known for years, it's not that bad. So am I really demisexual? Or am I just weird? And if I am, is it okay? (Also, hi! This is my first post on this subreddit.)