Am I a bad person for liking my step brother?

I know this is gross to a lot of people but I just want honest opinions on the matter and what I should do. I’m 18. My step brother is 21. Our parents got married two years ago, and have been together for 4 years total. When I first met him, I had a crush on him immediately. I find him to be very physically attractive. Because we were older, we don’t really have a sibling like relationship. We don’t speak that much. But when we do I can’t help but like him. I know it’s awful. I hate myself for it.

Additional question. I went to switch my laundry from the washer to the dryer but his laundry was in there so I put it in his laundry basket then took it upstairs to his room. I think he is sleeping so I folded it because I didn’t want to be rude and let it wrinkle but now I think it’s a mistake and I’m being creepy and violating him. I obviously didn’t do anything weird with it. I just folded it and left it by his door. But is that weird?