Some people just aren't naturaully funny, If you try to be funny it won't be funny...I have a friend who also isn't naturaully a funny person, so she just focuses on her other traits and everyone loves her...Don't worry be naturual, theres no real way to "change your sense of humor" [believe me I've tried] unless you memorize a ton of jokes and go randomnly spouting them off...And who knows if you just act naturaul and focus on your better parts you'll find a part of you that people find funny that you never even knew...Have an awesome life.....
Jokes in the moment. Like someone says something and you crack up a joke about it. "That's what she said," is an example. Take something someone says and turn it into something hilarious.