Here's a trick solve your confusion: if you could choose what's in those pants, how long would it take you to make a decide: if you instantly know you want what's in your own pants youre most likely gay, if you know instantly you want exactly what's not in your own pants you're most likely straight, if you need a moment before you know you're likely not straight nor gay. All the other reasons you can think of aren't about sexuality as in what gender do you like but are about sexuality as in what kind of person you want to be with. But it might also be a little more complicated than this.