Feeling of constant discomfort may accompany every sexual act, even after years of regular sex. It turns out that here it is not in the physiological characteristics and the structure of the female genitals. Almost always the reason for this is psychological problems that may occur on a subconscious level. The size of the vagina in different women can not be the same, but any one of them is fully capable to stretch to safely take a man's penis even large size.
If the same problem and torments you, the best solution would be a comprehensive examination by a gynecologist, and then a therapist or sexologist. To verify that the cause of pain were not running and chronic diseases of the genital organs, the first specialist to whom you refer, will be a gynecologist, who can confirm that your genitals are normal development. But medical workers the last two specialties will help you in dealing with the psychological problems that hinder live a normal sexual life.
It so happens that for some internal reasons, which lie deep in the subconscious, unconscious woman blocks those pleasant sensations that can be obtained during sexual intercourse. The subconscious mind is stronger than the feeling of love and a desire to get satisfaction. Therefore, exercise to ease vaginal muscles are meaningless - because a newborn baby passes through it with no problems.