Is it normal that i creamed in my pants?

So I was in the cafeteria line at college and this hot babe behind me was standing so close that couple times I felt her boobs on my back and popped a boner. Then at the cashier's she reaches in front of me and squeezes my side saying excuse me and I couldn't help creaming in my pants. It was so embarrassing but I don't think anyone saw cause I had on my jacket.