Get rid of my guilty feelings abot masturbation

I tried many times over to tell to myself that there is nothing wrong into what I do but I still feel a deep sense of guilt.
I feel I deprive my partner of an unique opportunity to have fun together even if I do have regular intercourse with him.
I have read a lot about it and a lot of web sites and still I have to completely free myself from this conception of misbehavior. I will keep trying…