It's completely normal for someone your age to become curious about their body and to experience feelings like wanting to masturbate. Masturbation is a natural and private way that many people explore their own bodies and feelings. Doing it in private, like in your own room where you feel safe and comfortable, is important to respect yourself and others.

Regarding your question about using images or fictional characters while masturbating, it’s important to understand that your imagination plays a big role in your feelings and enjoyment. Fantasizing or thinking about people, real or fictional, is a personal and private thing, and many people do this. However, make sure that any material you view or use respects healthy boundaries and is appropriate for someone your age. You mentioned keeping safe search and filters on—that’s a smart step to help avoid inappropriate content.

Remember, if you ever feel confused, uncomfortable, or have questions about your body or feelings, it’s very helpful to talk to a trusted adult, like a parent, school counselor, or healthcare provider. They can give you guidance and support to help you understand what's normal and how to stay healthy and safe.

Overall, masturbation is a normal activity, and doing it privately while respecting yourself and your feelings is okay. Just be sure to keep safe online habits and to reach out for help if you ever have questions or concerns.