Why can’t i make my girlfriend laugh anymore?

I’ve been dating my girlfriend for half a year now and at the start and even before we started dating i used to always make her laugh.

I’m naturally a funny person. All my friends tell me so. When i’m in a room with people i always tend to be the funniest person in the room and make everyone laugh, even now.

But for some reason i feel like my girlfriend just doesn’t find me funny anymore. I never hear her laugh at things that i say that most people would find funny, i feel like she just doesn’t get my humour anymore. It really took a hit at my confidence (only when im with her - because i can still make everyone else laugh) so i tend to force trying to be funny which i feel just makes it worse.

However, just recently she was describing me to someone and said that i was funny which kind of shocked me.

I don’t know if it’s just in my head or what