I told u islamic concept about it.
Prophet (PBUH) said '' The man who did nikah with hand is so bad"
Second islam jis thing c rokta hai ya khamoash rehta hai us thing muain sher ka pehlo khair k pehlo c ziada hota hai.
Islam ney sirf wife c aur woh bhi aik makhsoos way (Vagina) c sex karney ki ajazat di hai baqi tariqoun ko gunah (sin) Kaha Hai.
Third. Islamic scholars ka ikhtelaf hai k masturbation k baray muain. Kuch haram kehtay hain aur kuch kehtay hain Allah forgive kar gey ga. Islam ki talimat tuo ye hain k doubtful thing ko chor do.
Forth: Medically excess of every thing is bad
My personal experince is that with excessive mastrubation man loose the freshness of his face and weakness of nerves. But being young we cannot under stand it. When we will under stand age will be over 50.
I have made lot of research on it in medical too there is lot of controversy about it. Some say it is health behaviour and some consider it harmful.
No body can avoid it so do it but when u think that other wise u will be motivated to other sins.
But do not make it the habit