I am afraid I will become an ephebophile

Well I am a male, 21, I like girls about 20, 21, you know around my age, I see normal porn, I mean where an adult woman has sex with an adult man, but when I was scrolling in the porn page I saw a video of a woman, she was having sex with a man, I was masturbating but then I realized this woman looked very young, like a teenager, and I was scared and disgusted, I have OCD and clinical depression and I felt like a monster, I had intrusive thoughts about becoming a monster, when I scroll in a porn page, there are images from the videos, and I have seen some images where there are woman that look like teenagers.

I am scared, I don't have sexual excitation, but i feel like when I scroll and see an image like that, I can't resist to look at it, this didn't happened to me before.

Also, there is a girl in my college, she's 21 but looks like a 18-19 year old girl, and I like her, I don't have sexual attraction for her but I don't know, she looks like a woman I knew (that was my psychologist, I liked my psychologist , I'm sick I know), let me explain, this woman (the chick from my college) has some traits I like, skinny, white, black hair, relatively big eyebrows, hairy arms ( I don't know why but I like that), eyes that seem like asian eyes), I like her, but I don't know if I like her because she looks like a teenager.

Now that I think about it, I tend to like women that are similar physically to my mom ( I'm a sick man).

And finally I tend to fall in love easily, when a woman treat me good, with a kind voice and smile, you know, kind and lovely, I fall in love :/

What can I do?, I am quitting pornography already.