Am I in a abusive relationship??

When my girlfriend gets mad at me or we get in a fight she immediatly turns to hitting me, punching me, throwing huge objects at me, hitting me with objects, calling me horrible names, and telling me I am worth nothing, she hits me with anything she can find, she has threatend to kill me countless times. Now I know people would say of course you are if I was a girl, but everyone says its not the same for guys? Don't all girls act like this when they are mad at there husbands or bfs?If I was to tell anyone of my friends or family about this wouldn't they think I was wimpy or being rediculous? I cant just leave her because of my children. She trys not to do it in front of them. I just don't want to be a "part-time" dad, or one of those dads that leaves, and then the mom takes his kids for good! I couldnt live being away from my children!! I keep telling myself I shouldn't be so weak, for my children, I should act like a man. but its getting to be worse and worse and its just so crazy! What should I do??