I'm eighteen and I still don't know what orientation I am.?

I've dated people of both gender, and kissed more people than I can count on my fingers. I have been in a relationship which lasted two years. However, I am attracted to only a few people and have no real interest in relationships or partners. I know that I have commitment issues, and always feel like I need as much freedom as possible, but I am also indecisive. Is it possible I am aual? Or ? or just straight? I honestly have no idea. Does anyone know what I should do next to find out?