Cut myself in the shower... and liked it?

So I was having a shower and was holding my razor, when I slipped and when I caught myself I accidentally cut my inner arm with it. And I liked it. The pain felt good, and I loved seeing the blood. So I did it again, on purpose. I did it three more times and now I'm wondering what the **** I was thinking. I mean, I loved it, sure, but it's summer and wearing long sleeves not only looks weird but its tormentingly hot. Plus, if I pass the cuts off as an accident, people will get even more suspicious cause they don't look accidental. So, why did I like the pain, and how do I explain the cuts?