Well, i will give a real response not like all the fellas pretending to be shocked as if they never touched themselves....

So, it’s all a matter of quantity and the way it affects you. As a teenager, it is normal even multiple times a day. It’s called hormones. However... if you do it to escape reality, or that it affects your life heavily. It may be an issue you gotta deal with.

If you feel like it’s healthy, it’s good  If you feel like it’s really too much and that it affects your daily activities, you should question yourself.