Our teen years are full of curiosity and experimentation, so I don't think I would take that incident as indicating much about your sexuality now as an adult. More important is that you seem to be anxious about this.
I have always liked Dewey2k's take on such things. More important than slotting yourself into this or that category is whether you feel fulfilled and comfortable in your own skin, sexually as much as in any other way.
Nobody living can ever stop me
As I go walking my freedom highway.
Nobody living can make me turn back:
This land was made for you and me. (Woody Guthrie)