Straight af but ive been looking at girls

i am straight. like i love boys, obsessed with them and can fall in love so quickly with them. I see myself getting married to a boy, having k**s with him ect. but ever since ive joined here ive always seem to find my way back to the same girls profile and finding both romantic and sexual things when i see her. don’t get me wrong i think boys are so hot and i would definitely not turn them down but if i had to choose between a one night stand with a boy and one night stand with a girl i would choose the girl, especially this one girl i keep on finding. i find myself fantasising about girls and i want to sleep with a girl anyways i enjoy thinking about girls in both a sexual and romantic way but if i think about getting into a relationship with one id drop everything for it to happen. I used to have a lesbian best friend and i used to think alot about sleeping with her but never thought of being in a relationship with her... Is this a wrong feeling? What am i feeling? Am i even straight? I just need help.