hello . im about 18. i start masterbating when i was 10 and it takes about 2 months that i stop that.when i was 15 i start again and i do it about 40 times in 4 months. again i stop that but now from 43 days ago i start masterbating and i do it about 9 times until now. now im so worrid.my school exams are going to begin in two weeks from now ! dose masterbating effect on my memory?