It is common to worry about size, but most men actually have a normal, functional size. Over-the-counter enlargement pills do not work and can be harmful. For sexual stamina, improvements can often be made through lifestyle changes like regular exercise, pelvic floor (Kegel) exercises, and a healthy diet. Techniques like the 'start-stop' or 'squeeze' method can also help. If you experience premature ejaculation, a doctor can prescribe medications like SSRIs or topical numbing creams. I highly recommend consulting a urologist or a sexual health specialist to discuss safe, effective options tailored to your needs.