What is up with me am i biual?

i am about to be 15. i have allways been straight n i mean completely i never thought about guys. everything was about the girls EVERYTHING. now last week my friend who is a felt like seeing a gay video at my house so she put it and i didnt pay attention to it. later i tought what makes people go gay. then i asked myself to make sure i wasnt. n den i pictured myself with a guy and ever since then i can see myself having with another guy eventhough i would prefer a women. riet now i only daydream about girls and think about girls but eventhough i dont find guys attractive or dont feel like talking to them like i would if i saw a hot girl i can see myself having with another guy. so can i just be horny becuase i always am or am i becoming after 15 years of being straight. dont foget i dont think guys are attractive or cant see me loving a guy ro anything yet i think i would enjoy . while with girls i find them attractive check them out and daydream about them and want to have with them. but i can see mysefl having with a guy even if i dont find them attractive. also if it helps i dont act gay or have gay tendencie when dont worry about being . so when i dont worry i act staright. but then it bothers me and i get sad becuase i can see myself with a guy sexually so wtf.