I'm going to tell my girlfriend that when we have kids they will have my surname
I think that's unnecessary. Why do you need to tell her about your kids having your surname?
Since a long time ago a friend of mine wrote a message to me that a man should claim what he owns and not be a doormat
There is nothing wrong with your children having your last name. As long as your girlfriend is fine with it.
I really hope she will be okay of them having my surname. I think it would be best for the family. If she doesn't I will be very upset with her.
I feel like it is incredibly unhealthy for you to demand things from her specially when you say things that you can't live without her when she doesn't' even love you. I think she loves you because otherwise she won't be your girlfriend, and I just hope that you don't ruin that love by demanding things from her, and you should ask nicely about the things you want so that no one feels forced.