Is it normal to not know my orientation?

I just did a quick search and I think the term that most closely fits your description would be homoflexible which is different from bi, in that you're mostly attracted to your own gender.

You don't have to settle on any orientation. That's called pan sexual nothing wrong with that. Just be happy :)

experiment see what happens

It is because you did not accept yourself.
hetero or gay or bi... What do you care? They are just brands.

What you are really looking for is not a gay or by or straight person,what you are looking for is to get a certain kind of emotions you can feel satisfied with and that will eventually lead to sexual pleasure. What happens to you is this:
You look fkr a guy,you find the guy,you have sex with him,and then another one the next time,till you just go:I can't take this anymore,cause the guys you go for or go for you,alk behave pretty much the same way towards you,so you start wanting a chick,just for a change.But then it gets boring cause most chicks you know cannot give you what you really need emotionally,so you start feeling like going for another man,and the cycle repeats itself over and over again.And the only way to stop this cycle would be finding yourself both a male and female,to be basically,the madman in the attic to have sex with whenever they feel like spicing things up or one of them is not around.:-) I think people have sex with whatever turns them on,in any way they like,that does not make them gay or any of the preconcieved brands already in place.