[ChapperIce]

Is it just your clitoris or is it every part of your vagina that is too sensitive? If it's only your clitoris, then try using your fingers inside to stimulate to finish properly. I'm like that, it gets really intense and I can't stand it sometimes, but it's only my clitoris that does it.

If it's all over, then maybe either try different ways of masturbating or maybe ask a gyno, though I'm not sure it's a sign something is wrong, but it's always helpful to have professional insight?