Sexuality can be a really hard thing to figure out sometimes. It can take a really long time, too.I've struggled with my sexuality/gender for as long as I can remember, but I realized (after months of being told this) that it's normally not something you always know about yourself immediately.
I have a feeling that if society was more open about gender and sexuality this would be less of a problem. It's hard for people to explore who they are when who they are is normally condemned.
Just know that you have every right to explore this and you do not have to 'make up your mind' or figure it out any time soon. You can months or a year or 10 years or 20 years or however long it may take.
A tip from me, (the guy who has spent too much time fretting over his identity and giving himself massive anxiety over it) is that you shouldn't focus on it.
Let it come to you through experimentation and self discovery and so on.
I know it's hard to not know these things, but they will come one day.