Dear user, I understand your concerns about stopping masturbation and penis size. Masturbation itself is a normal part of sexual enjoyment and does not have any adverse effect on health. One can continue after marriage also, if it gives pleasure. Masturbation does not reduce semen in body because semen is produced continuously starting from adolescent to lifetime. It gets produced as ejaculated. Nothing to worry about. Penis size has no effect on sexual satisfaction of the either partner. ‘’Bigger is better’’ is very rampant myth. Don t let myth ruin your sex life. Only lower vagina (outer one and half inch) lips and clitoris is sensitive, deeper part is largely insensitive. You remember that what important is strength and not the length! Entry and to and fro continuous movements are adequate to arouse partner to climax. Inability to retract penis skin backwards may be phimosis. Have a check up with general surgeon/urologist for this. If it is so, it can be corrected by minor surgical procedure. You can overcome shyness by approaching to counselor or sex therapist. I see many patients like you, but they eventually open up when talk to their therapist. The problems are temporary. Go ahead with treatment. Wish you good health.