im confused about my sexuality!

I don´t know what i am. I´m not really big on labels but its been years of confusion and I need some opinions and somehow guidance.
When i was in 5th grade i had a best friend who is my neighbor, and we ended up kissing a lot (i don´t even know how, but i loved it) I don´t think I ever had a true emotional crush or relatioship with her , but in 7th grade we would have a lot of sexual intercourse after being kind of ¨together¨ for 4 years. I really really loved it and after i moved schools and we drifted apart, I found other girls in highschool. But i never really felt an emotional attachment or had a crush on these girls, I just really wanted to have sex with them and the thought of having sex with a guy .... is gross to me? but i love boys?? like i´ve only had true romantic feelings for guys but never in my life sexual... only sexual attraction towards girls.
I also have a best friend who came out as bisexual and i kinda wanna have sex with her now... but i genuinely think i can eventually have feelings for her. I´m just scared because my family is conservative...and hers is too. So ?? she doesn´t know i want to have sex with her. I came out to her about this issue two years ago when i was 14 and recently she came out to me as bisexual. So?? should i try to be like friends with benefits and see where it goes? and how would i approach the situation? because i doubted if i as bi based on only being sexually attracted to women but me and her have been best friends for a while and she´s beautiful, sweet, funny and just amazing... so maybe she might be my first true girl crush?