Is it normal that i like to prairie dog/turtle?

Ever since I was a kid, I'd stay up late and prairie dog. I take little shits, enough so it pokes out a little, then I suck it back in. I do this over and over. It's like relieving an itch around the asshole, and it's sends a nice feeling up my spine. I pee a little too. It's a strange habit.

Aside from this though, I don't like things up my ass. My girlfriend tried it with her finger, and it was an awkward feeling. It really is just with shit. I'd like to get professional thoughts on this, but all comments are appreciated.