Abnormal penis problem now that we are married. should i divorce?

Can't tell you: That's between you and your wife. No one can tell you when and why to divorce.

Depends: It depends on what the problem really "is"? If it is a performance/ medical issue than this can be treated very effectively usually. If this is a relationship emotional issue than it depends on what that is? If the latter, i would recommend communicating with your partner and if necessary with a counsellor or even a sex therapist if necessary.