How to know if you’re bisexual?

I’m almost 18 & ever since i was a little kid I’ve been attracted to both guys and girls but I’ve only ever dated guys but girls get me a different type of turned on 😍 i would loveee to try something with a girl and i have a couple bisexual friends but i don’t want to tell them and it not be true or try something with them and it fuck our friendship up so idk