If you are able to cum when you masturbate then, there is physically nothing wrong with your sexual reproductive organs. It's a mental thing.
Usually what happens is that the person is focusing more or less on the final goal, which is orgasm or pleasing the partner with an orgasm, and not really focusing on all the rest of what goes on in the sexual encounter. It is affecting your self-confidence. You might check with your doctor and try a impotence pill that will give you that added confidence and self esteem you need when your with your gf. It works for me.
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