I can remember being your age and not quite knowing how I felt about my sexuality. It can be confusing and scary to feel like you don't know what you want!
When I was your age, I didn't know what bisexuality was and the only narrative I'd heard about queerness was the "I've known I was gay since I was 5 years old" story, so I thought I had to 'pick a side' and that I should already know. That's not true! It's okay to be anywhere on the sexuality spectrum and slide up and down and all around it as time goes by!
What I found to be the most helpful when I was feeling like I HAD to have an understanding of myself, was to just give myself the label of "not knowing". It can be so awesome to just let yourself not know, and enjoy the curiosity that comes with not knowing. I know it sounds cliche for me to say this, especially because I know how confusing it can be, but things will work out! You can totally trust that you don't HAVE to know in this moment. It can be fun and scary and confusing and interesting and weird to figure it out over time, but that's kind of how everything in life is, not just dating and sexuality