my age is 16, i am a runner i am performing 100, 200 and 400mts i have been mastributing 2 years i want to know is mastribution lows up my speed, stamina and running performance, when i iam running my 400mts i do good in first 300mts next 100mts i can t do well i looses my speed, stamina everything friends told me this is because of mastribution