I love to beat myself with my belt

I love to feel a leather belt on my bottoms when a nice woman ties me to the bench, makes me completely immobile and then she uses her belt on me.
She knows my limits so she doesn't pay too much attention when I cry because of terrible pain, I can't move out of the way and she has a free range of motion.
When she finishes usually after 30 belts and unties me, I curl up, jump etc.
After some time I feel a very big relief, there's no stress or depression - just pain which makes me me feel much better.