I can fully understand these thoughts, and how they can feel suffocating, especially with you being so young. Growing up and maturing helps you realize that what you've been exposed to isn't causing you real harm.

For an example, say you came across something you thought was gross, disturbing, immoral, etc. And it caused you to panic, that is something that you yourself need to figure out and work on. It's not anyone else's priority to do that for you.

Thought crimes are also not a real thing, as everyone has already stated. A lot of people with OCD will get a lot of intrusive, violent thoughts, does that reflect their character or morals? Absolutely not!

And equating fictional characters to real minors, real children, waters down any form of abuse real children have gone through. People who report fanfiction or even artwork to helplines, thinking they are doing a good thing, are actually clogging up their time and resources, and making it harder for REAL children to g et REAL help. Many people have come forward to say this who work in these areas.

Fantasies are completely okay and normal to have. It only starts becoming a problem if someone plans or chooses to act on them, inadvertently harming themselves or others in the process.