Every time I ejaculate after masterbaiting my penis gets so sensitive I have to stop

That is something you don’t have to worry about at all – both men and women can handle only certain level of stimulation before their genitals become too sensitive even to a slightest touch, as you have experienced. It’s not something that can or perhaps should go away, it’s just the way our bodies are built. That is just a signal that your body needs a little bit of rest. With time, as you grow older, you probably won’t be as sensitive after ejaculation as you are now, but some of it will always remain because it’s just the way things work.

I'm like that but I don't ejaculate