Hi and welcome to HCM.
Masturbation is very common phenomenon in adolescnets and you no need to feel guilty and anxious about it. Here are few tios to control urge for masturbation.
1.Find another outlet for your time and energy. Fill your life with engaging activities.
2. Enjoy some out door sports
3. develop new hobby
4. If you have problems before going to bed or in the shower, refrain from any temptation to masturbate. For instance, if it's a problem late at night, drop to the floor and do push-ups until you're too exhausted to do anything but fall asleep. If you find shower time too tempting, start using ice
cold water only
5.If you masturbate frequently because you feel lonely, find ways to be as socially engaged as possible, means avoid loneliness
6. Stop watching porn on your computer or TV. Throw away all porn material from your room.
7. Their are many myths involved about masturbation, your chest will not be affected due to masturbation
If nothing helps you, consult a local doctor for help. All the best
Regards
Dr Santosh