I've just been cercumcised at age 21. My foreskin was tight and I couldn't pull it back when I was erect and if I tried it would hurt and my frenolum breve (banjo string) seemed was really tight also which was painful.
When I shown my penis my docter he recommended me to be cercumsized. When I shown the surgen he said I would be stupid not to have the operation.
So I think you should go to the docters and they will let you know if there is a serious problem or not.
I had the op done just over a week ago now and I'm in pain. They said the healing time is between 4 to 6 weeks.