Struggling 😅

So in November my dad and his fiancé blended our families. I now live in a house with my three (soon-to-be) stepbrothers. I've started to become attracted to one of them. I'm 19 and he's 21. I go to college locally and he goes to college a couple hours away so I only see him on weekends. I know this is a real problem. It's not like I'm in love with him or anything. The attraction is mostly physical. We've all known each other for years. My other stepbrother is my age and I can hug him and tell him I love him all day and spend time with him because he is without a doubt my brother. That is who he is to me. We're like all other siblings, minus the blood. But it's not like that with the one I'm attracted to. This probably contributes to why I'm attracted to him (because I can't see him as a brother). I don't know why I'm making this post. I guess I'm just wanting to know if this is weird or not.