Confused

Sometimes life throws things at you that makes you feel like your world may just be awseome,, then other times you feel like just sitting in a corner and bawling your eyes out...you know what i mean? Don't you wish that happiness could just be an ongoing thing?
Why isn't it there is such a thing as a broken heart or backstabbing?
Is it to make us stronger?
Or to make us realize that we are human and that we can hurt?
I don't really get it.
I hate getting hurt but it seems like every time i put myself out there i get hurt..So whats the deal? Cause if i weren't to put myself out there then that would hurt me even more...wouldn't it?
Life is so confusing.
One minute i am completely blissful and the next im breaking down feeling like its the end of the world. Wow that only sounded a little bit bipolar. 

I'm not bipolar. I'm just a very confused girl who is just trying to figure out who she is and why she cant just be happy... thats all.i just want to know..WHY...
does anyone really know or is it one of those big philosophical questions that everyone has to answer for themselves.?

Looking for answers....that are most likely not going to be found yet...