I don't feel like a man since I can't have children.
That sucks but why do you feel like less of a man because you can't have children?
I feel that all men should have children.
Not having children does not make you less of a man. Not every man on the planet has a child. You should not tie your feelings about yourself to things outside of yourself you cannot control.
I can't compare myself to other males since no one else has the same problem as me. I believe I'm far superior to everyone else including my girlfriend. It's her fault she can't conceive children.
Now I am thinking that the issue isn't with you but with your wife who can't conceive? It is unfortunate, but you can always try adoption, invitro, or finding a surrogate. These methods have been shown to be effective for people who are unable to conceive naturally.