can be from the more intense feeling during puberty or can be an underlying mental issue

it's normal....there's nothing wrong with you

I think I cry a lot too, but I'm sure that a lot of people cry and just don't admit to it

I'll admit it, too. I cry.

It happens sometimes to me as well.
I think most of it is hormones tbh.

I have days I feel like crying every minute and get completely frustrated with everything

But I don't actually cry that often (even though I feel it alot inside ) I've got too good at hiding it

totally normal. hormones and girl issues fuck with your emotions big time.

Maybe you feel down?

100% normal, hormones and being on my period makes me cry every time

Yes
Hormones can be so horrible