Hysterectomy at 16?

It's completely valid medically. However, at age 16, you don't know for sure that you won't want children someday. You would hate to make a decision that could haunt you forever. Make sure you weigh everything out for a long time before you make a decision. It sounds as though you have. If the pain is too bad, a doctor will give you no choice about it. You are in a tough spot, but if you don't want kids, the choice is clear.