I love jokes, but I am so bad at telling them.  I have no timing.
Jokes aren't too hard to tell. They're just displays of humor in which words are used within a well-defined narrative! You gotta get better at telling stories.
Stories I can tell, but jokes just escape me.  I think if I knew the structure of jokes better I would enjoy stand up comedy less, though.
You can't forget the punchline! Maybe that is your problem?