Okay kiddo, sometimes people have thoughts about sex that keep coming into their heads even when they don't want them to. These thoughts can make them feel worried or scared, and they might try really hard to stop thinking about them.
These thoughts are called sexual obsessions, and they can happen to anyone at any age. They can come in different forms, like feeling worried that something bad might happen during sex, or feeling like they have to do certain things during sex to make it feel okay.
It's important to know that having these thoughts doesn't mean something is wrong with you, and it doesn't make you a bad person. Sometimes these thoughts can be caused by anxiety or other mental health issues, and it's okay to ask for help if you need it.
Talking to a trusted adult or a counselor can help you understand why these thoughts are happening and learn strategies to cope with them. Remember, it's okay to ask for help and you're not alone.