You didn't know, I'm sure.

You didn't know that you'd fall in love.
You didn't know how much the whole world can make you feel nothing.
You didn't know what was like to look at someone and feel something wonderful in yourself.
You didn't know what horrible was realising that the person you love is looking at other girl.
You didn't know what beautiful is when that person makes you smile, when in fact, he's smiling.
You didn't know that we are always discovering new feelings.
You didn't know that when that person is not with you, you're always thinking at him.
You didn't know you could think someone was beautiful.
You didn't know we do the same gestures and things that the person we like does.