Im Confused.

Im not sure if I can call myself straight girl or not. Everytime I see a hald naked women or cleavage of a women, i get horny. But I dont want to have sex with any women as of now. I get insecure because of it also. I have a girlcrush that everytime I saw here my heart beat so fast and I found it weird because Im not sexually attractive on her. Yea when I see boobs I get horny but when I think having sex with a girl, I lost all horniness on me. Someone experience like this? Or maybe Im just so confused about my gender. Someone give me some advice. plss.