Talk to Sexologist on Problem With Penis

in my early days of puberty I did excessive masturbation then I faced a small problem related to the erection of the penis.I was normal but I was feared that I had a problem with my overcome this fear I again and again masturbuated to check penis the age of 17 Onece my penis was fully erect and I was masturbating I realized as some membrane in my reproductive tract was my urine analysis I found penis is become shrink and tell me the cause and treatment of disease.I am much worried about it.25 year unmarried student of Msc zoology.