This discomfort or even pain is a normal reaction when you are aroused and get no release. In these cases, masturbation can help. Masturbation is one way of getting a relief if there is no chance for sex with a partner. People react differently, some men maybe do not have these problems, or they are not so intensely aroused or they reduce it by masturbation, but your discomfort is a natural reaction to the sexual tension. Masturbation can probably help.
What you talk about is not normal..When I was younger guys would tell there girl friends that after getting aroused they had to have a release or there would be pain in the groin region..
It was a ploy to have there girlfriends to have sex with them....Men have gone for yrs with out sex and not had any problems...
Take care...)