No, it is not too much. This question is frequently asked by teens.
Here are some recommendations for teens:
Masturbation for teens
Masturbation is a normal and expected activity for teens.
One may masturbate as much or as little as one wishes, however one may experience temporary sexual exhaustion due to very frequent masturbation.
Three times a day works well for many teens.
1. Do it before school in the morning. This helps you get through the school day without being excessively h*rny.
2. Do it after school because you have gone a whole day without masturbating.
3. Do it before going to sleep. This helps with restful, sound sleep.
4. One may do it more than three times if necessary.
The movable, internally-lubricated, nerve-laden erogenous foreskin with its gliding action is an important aid to masturbation. If you are missing your foreskin, then you will need lubrication to avoid friction irritation.
You can’t do it too much. Your body will tell you when it has had enough masturbation and you will stop for a while.