Sometimes when people are younger they can feel they are attreacted to the same sex because that is the sexuality they are most familiar with before they become more experienced with the opposite gender. Who's sexuality is anyone going to be more familiar with but their own? I had a relative who went through a short phase of thinking he as gay, I think it may have only lasted a couple of months, myself and his mother didn't make a big deal or treat him any differently, but when he started hanging out with girls more suddenly the whole gay thing went out the window and he couldn't have been any straighter. So that could be a possibility as to why you feel the way you do.