I think quite a few pedophiles probably feel very guilty about their attractions. So yes, I think someone can be a pedophile and also obsess about it.

That being said, there is something called Pure O, which is the "O" part of OCD. It involves intrusive thoughts that can be about many things, one of the main ones is "Pedophilia OCD" where you think you are a pedophile but you truly are not. Usually those with this branch of OCD are disgusted by pedophilia and even more disgusted that they are having these thoughts. Sometimes sufferers mistake anxious reactions around children for a genuine arousal reaction.

I used to struggle with harm OCD, which were intrusive thoughts that I would harm others. I would avoid people, sharp objects, and I thought I was a monster. Through several inpatient stays and top notch therapy, I was able to overcome this and have not struggled in years. It is rough while in the mire of the thoughts though, to distinguish what is an intrusive thought and what is a genuine desire.