I definitely agree with withorwithout you.

Are there any things where you are both laughing out loud at the same things?

There are things that my husband thinks are hysterical where i don't laugh at all.
But we do have things that we both think are so funny and we can make each other laugh pretty regularly - not so much with stories, but with little jokes and observations...I don't know how long you've been dating your girlfriend - maybe you need to be together a little longer to have these inside jokes or just to know each other's sense of humor better.

can it make or break a relationship? It sounds like it's bothering you a lot more than her. T