Hello thanks for asking from HCM First of all I would like to tell you that masturbation is safe and healthy practice and it is not associated with loss of potency or loss of fertility. So there is no need to fear for that. Secondly it is not the size but levels of erection which maters in sexual intercourse. Size of penis varies between different individuals and between races so little change in size doesn t affect sexual intercourse. From your question it seems that you have problem of premature ejaculation. It can be treated by medicines and by non-medicinal methods. Medicines like Dapoxetine is very useful. Consultation of a psychiatrist is needed for detailed prescription. Herbal medicines like Tantax Royal have good role in premature ejaculation. Try to divert your attention while doing intercourse and this will delay ejaculation time. The erection of penis even on touching a girl is not a normal thing. Try to relax yourself by playing outdoor games, relaxation exercises. Don t watch excess porn movies as they affect the brain. Visit a psychiatrist if problem persist. If skin is not getting removed it could be due to phimosis. Consult a surgeon to get opinion for that. Thanks.