Help please

Im 16 and im pretty sure im gay, ive never had any sort of attraction to girls but throughout my life ive just always felt more comfortable around guys and for the longest time I would say to myself "I wouldn't mind being friends with that guy" but only friends, and ive thought more about not minding if a guy tried to cuddle with me and then it escalated to "I wouldn't mind having sex with a cute guy" and thats when I pretty much knew. But im worried that later on in my life I'll realize that I like woman and plus I couldn't do that to my possible future boyfriend. Also im not ashamed of being gay if thats what I am but I would like to know for sure before I (come out/start dating).