How to know if you are gay?

I'm only 14 but I'm really unsure about my sexuality all my life I've been attracted to girls but a few years ago someone came into my life (who is a boy the same age as me) and I love him. He is the only boy I've ever even liked in my life but I just love him. He is my best friend and knows that I love him but I still feel attracted to girls. Please help!!