I have a sort of belly button fetish?

Well... I don't a big fetish as in I get sexually aroused from it. I just like to play with my own belly button from time to time. The only ones who know about this so far are my 2 best friends and I think a couple of other friends and aquaintances from accidentally hinting at it. It's been going on for a while now and I'm not very sure how it formed... It just sorta happened? I also take a few pictures of it occasionally so I guess that counts for something.
I'm highly certain I'm not the only one...