How normal is not being Maternal ?

I just can deal with the idea of having a child. How is that I don't have a maternal instinct ? I mean I can deal with them but the idea of having one of my own really depresses me. I thought that it was a matter of time when I could change my mind but, I hate the idea of it. 
I see moms saying is the best thing that has happened to their lives but they look like crap! 
And let's not even go to pregnancy, I just found it horrible. 
Do you think one day the "maternal bones" on me will wake up?