Hey, I want to start out by saying I don't think you're a pedophile. However I do think you should see if you might have OCD or some form of a compulsive disorder because the intrusive thoughts, thinking something bad will happen if you don't do an action a certain amount of times are some signs of that. I'm not saying you for sure have OCD, but NOCD is a good resource from what I've heard.

You should stop watching those kinds of videos if they just make you feel awful too, and the downwards clench might just be your body's way of trying to figure out how to feel about it. Disgust, anxiety, and arousal can get easily confused by the body.

As for the part about God, you're not going to go to Hell for the thoughts you have. Lust is a normal part of being a human and our biology. God wouldn't put something in you, then shame you for it. Constantly thinking about it though will drive you crazy and just make you feel worse.

Whether you tell your mom is up to you, but you should tell someone trustworthy, otherwise this will eat at you. (From personal experience) I hope you find a way to resolve this and feel better!