Nervous during sex?

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When im about to start sex i get a little nervous and i shiver a little. I've had sex a few times and all with the same partner but i always get a little nervous and i cant seem to grow out of it. Also sometimes im so nervous that when were doing it my penis goes a little soft and it never seems to go fully erect, it also happens when im getting a favor, but when im giving a favor my penis is fully erect in my pants. Im 15, i know im young but still, please help?

Given your inexperience it's natural to be nervous and have such a reaction. That will pass in do time as the experience becomes more familiar and less frightening. The best you can do is relax, enjoy and make sure your condom isn't out of date.