I kissed a girl!...?

A few days ago I was with two friends, a guy and the girl. These two are friends but there's a lot of chemistry between them (despite the girl having a bf), so they stayed attached to each other for most of the night. But me and her being curious ended up kissing for a few seconds...

Welp, now I know that I truly am, without a doubt, 100% gay! I didn't get aroused by the kiss, but I didn't necessarily hate it either.