It’s normal to have questions about your body as you grow up. Masturbation means touching your own private parts. It is a private activity, and you never have to do it.
Doing it with a friend isn’t a good idea at your age. You and your friend are still children, and it can be confusing or uncomfortable. You can say, “No, I don’t want to,” and move away. A friend should respect that—no pressure, secrets, or touching.
If a friend has asked you, or anything has already happened, you haven’t done anything wrong by asking for help. Tell a trusted grown-up, such as a parent or caregiver, school counselor, nurse, or doctor. If anyone is pressuring, threatening, or touching you in a way you don’t want, get away and tell a trusted grown-up right away.