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 আপনি find weird to think of that নেকড়ে "that" way, but I think you'll grow it out soon enough.

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

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