My girlfriend has a friend in need and I'm feeling the urge to make her choose me over her friend.
Why do you want your girlfriend to choose you over her friend that's in need?
Because she's my girlfriend and I should be her first priority
I know you want your girlfriend to be with you, but she has an obligation to help her friend that's in need. You shouldn't expect her to spend all of her time with you. It's wrong for her to be with you instead of helping a friend in need.
If she does come over here to be with me instead of helping her friend, I'll make it a point to be as abusive to her as possible so that she knows what she's missing out on.
This is the wrong way to go about getting your point across. I think you may have huge issues with jealousy and you need to work on yourself to not feel this way. This will cause more issues in the future with your relationship.