I don't know what my sexuality is. I sometimes like men, sometimes women other both but really often no one. What does that mean?

I think that mean your gender is not the most important thing for you, you value other things. Like... If someone doesn't care about clothes he/she wears any random things and doesn't pay much attention. Just be yourself, doesn't matter is it a boy or a girl.

At the end of the day, your sexuality is just a label. Like who you like, and have no shame in it. If you turn out to be bisexual - awesome. Fully gay, that's great too. Straight, sure, that's good too. Just like who you want to like, and I'm sure it will work out fine for you.

It is completely normal and okay to not know what your sexuality is. Sometimes sexuality is very fluid, and other times it seems set in stone. I would just allow yourself to welcome whatever feelings you seem to have and embrace them! Dont feel pressured to label it, because sometimes there is never really the “correct” way to do so!

It means you're in the process of finding out what your preference is. This can be a long and tedious process, but often a necessary one. If someone asks what your sexuality is, just say you don't know. It's fully allowed to want to experiment and want to switch until you find one you're comfortable with. Personally I said I was straight for the longest time, until I got a girlfriend. Then for a while I said I was bisexual, then went to lesbian before going back to bisexual (which I am today). So it's allowed to go back and forth too. Take your time, don't rush anything. It's an important decision, one you can change at any time.