1. Size of Penis is your natures gift as a male so respect it irrespective of its size.
2. If you are able to perform the act of Masturbation
then no need to worry.
3. For your kind information size of penis never shrink or lessens so don't worry about its shrinkage.
4. In your relationship what is important to her? size of your Penis or Love & Intimacy?
5. In females only the initial 1.5 inch of the vagina is sensitive so even if your penis size is 2 inch you can still satisfy a women.
6. Don't judge the future of your relationship on the size of your Penis.