First Time

One time when I was eleven, I was laying in my bed trying to go to sleep. I had heard of kids talking about masturbation in school, and I decided to try it. As soon as I thought about doing it I got hard. I started to rub my dick with my thumb and forefinger.

When I reached orgasm, my hips started to buck and my dick was suddenly to sensitive too touch. Though it was dry, I lay there sweating, and almost fell asleep instantly. I have been masturbating since, but they have all been dry. Is this normal?