Yes it causes you very badly ,when i was 12 i was like very healthy my hair growth was very good and also they were all very thick and dont even i had any weakness in my body during running etc nor i had stress at first masturbation gives me pleasure and i increased my rate of ejaculation through masturbation weekly than after 3 days after that everyday continuously since that time i was doing it regularly and now i am 16 yea it causes so much differences in body now compared to that when i was 12 i get weak now i lost many of my hairs from the front they aren’t even thick now got sick mentally stressed eventually now today i am having very bad pain in my stomach after doing it last day two times and i am searching for it and these are the answers i got no its ok its ok it doesn’t cause you its really very good now i am too much dissapointed but i dont want anyone to be like me please guyz stop or you will be addicted to it if its your starting than leave it now it’s easier to leave now best time or it will be too late as now I couldn’t stop my this habbit but i am fighting with it don’t know how but trying not to watch porn from now on or any other bad things which rises me to do this but don’t why because i am addicted now and its too hard for me but still i am trying and one last thing i forgot also i dont have any acne problems before or i dont foget anything but i cant even remember things happened last minute now this my situation also got memory loss.
In answer to your question. I've been ejaculating since I was 11 as well. I ejaculate twice a day and have done for the past 44 years. I'm 55 now. While in teens I would go up to 10 times a day. I recently had a sperm count done and the results are I create 47million sperm cells per ml with a volume of 4ml. So all that shooting has not damaged me. If anything I'd say it helps keeps the tube clear and increases you count. So my advise is don't worry. You will not go blind and it wont fall off. Just keep doing what you are doing knowing no harm will come of it.