You might be over thinking your jokes. Try not editing your reaction thoughts. The first thing you think is often wrong or absurd but it can also be very funny because its wrong or absurd.

For example, Louis CK has a joke about seeing a person walking with their dog, and also talking on the phone. The person is holding the leash and the phone in the same hand, so the thought that popped into Louie's head was, "I wonder what the benefits are of hooking your phone up to your dogs leash?".

Jokes need to be some version of something you really shouldnt say, for them to be funny. Reasons you shouldnt say something could be: its shocking, its silly or wrong on purpose, its taboo societally, its offensive, it punches down, its too personal, etc etc.