Hi, I am 26yr/165cm/72Kg , i am doing too much masturbation from 16yrs, still i am doing. when i was 18 yrs old my penie size 4 inch(faciad state) 6 inch (Erection state), but now i have 1.5in - facid state, 2.5 inch erection state, it is very soft erection. please guide me how to cure this?