I feel uncomfortable about my dirty thoughts.

Well, in your age, your body is overflowing with hormones, so it's pretty natural to think like "that" of many.many things. Such sexual thoughts should not be considered as "dirty", it's completely natural and healthy to have thoughts like that. I understand that 你 find weird to think of that 狼 "that" way, but I think you'll grow it out soon enough.

All I would do is think about a celebrity crush 或者 something.

I would refer 你 to my friend Shadow354. He'd be able to answer your 问题 better than I. As a 15 yr old wolf, he's best suited.