Help! Did frequent masturbation (ejaculation) from the age of 15 (male)and from that point my height never increase. And at age 16 my growth plates fused!

Masturbation. Nope. Absolutely not. Masturbation, which is a common and natural part of the human experience, does not in any way cause genetic or anatomic health consequences. Every boy and man you know masturbates or has masturbated. There are no negative health consequences to this natural sexual activity.