Is it normal that i can't cry?

I can never cry properly. Few days ago my friend who I trusted and believed in a lot just said we can't be friends anymore because our friendship was never 'great'. But that's not the point,when she said it I thoguht the only thing I could do was cry, cry, cry. But I couldn't. I remember last time when I honestly cried was pretty much 2 years ago. Back then my parents were going through divorce and I cried for my dad and me not living with him anymore, going to a new place, going away from my friends and all that, but it was mostly 'cause of my dad, I couldn't bear with thought of leaving him brecause I loved him and I still love him a lot. And since then the only way I Can cry is when I watch a really sad movie. But I don't count that as actual crying. You watch a movie and the next day you'll forget it,simple as that. The nearest I can get to crying is by yawning so my eyes tear up (just comes naturally), I used to also get goose bums but even those don't come anymore no matter what I'm going through. And I'd understand if I wouldn't feel sad, but I do, just tears wouldn't appear, and I had tons of occasions to cry. It feels like crying would make me feel much much better and maybe some people when they'd see me crying understand what they're doing. but no, nothing, I can't cry in public or on my own, thought I can, and I do show all other emotions a normal person has.
Sorry that it is a long one.