Am I 'demi-sexual'. I am beginning to think I am. And please no useless comments saying 'demisexual' doesn't exist. I want actual help.?

I'm a 16 year old guy.

Well I was always obsessed with girls and last year pretty much every second girl I was attracted to.

If I had a crush on a girl I didnt think at all about having sex with her, I only wanted to date her and do romantic things with her like kiss and hug and touch.

Now I am the complete OPPOSITE.

I can not look at a random stranger and find them sexually attractive - I just can't anymore.

Sometimes I do, but this is only very rarely, and if I do end up masturbating to a random stranger, I regret it after and end up feeling nothing. Nothing at all. It feels like complete sh*t to be honest. No pleasure.

I have looked up Asexuality and Demi-sexuality and always wondered if I am.

There's actually this girl I have a crush on who I am friends with. I masturbate to her all the time and it is the best feeling in the world, I am physically attracted to her in almost every way.

But if it was a random person then no I don't feel any pleasure at all.

I look at random girls at school and feel nothing...ever. I see them as just people, really.

I can't even look at a girl and think "Oh she's pretty" or "She's beautiful". Everyone, male or female, just looks exactly the same to me.

It's only when I have a crush on a girl am I attracted to her and only her...