Sexuality is a fluid concept. No one term can truly define it. It can be a difficult thing to define, especially in your early teenage years. Many teenagers go through a phase questioning their sexuality, so it is quite normal if this is how you are feeling! Figuring out what your sexuality is about how you feel inside as a person, not the result of gathering evidence. It is quite normal for you to on occasions be sexually attracted to people of the same gender and not be gay!
As a teenager your feelings can be very intense. They may also jump from person to person (and gender) quite frequently. This can be quite a confusing experience, but it can also be quite exciting.
Don’t be too quick to attach a label to yourself; your sexuality doesn't develop overnight. Take your time to figure out how you feel inside.