In love with straight best friend

I am in love with my best friend who unfortunately is straight, who I have also lived with for the last 3 years. We are really close friends and I really want it to stay that way but I don’t know how to get past my feelings for her. I fantasise about her all the time and can’t decide if it is wrong and weird or if it is ok since it is just in my head. I also don’t know if she knows or not, we both talk a lot about guys and she knows I have been on some dates (I am physically attracted to guys but only crush on girls), but she knows I always want to be close to her and can’t get enough of her. She has commented many times on me being cuddly or noticed that I stare at her. I don't really know how to manage my feelings, as she is my best friend and I don't want to lose the friendship but I almost feel like I am violating her since we have such a close friendship but to me it is something more. I don’t know if I should bring it up or try and withdraw a little from her or if I am a weird creep for even feeling this way and letting it go on this long. If anyone has been here, on either side of this, or has any advice would be great.