I would like your opinion on the next: I'm a very funny guy, I've made people around me laugh for all my life, but sometimes I make a great joke and I start feeling bad because more people could've heard it.

Is is because I want attention? Is it because I don't feel like I have anything else to bring at the table? Is it because I care too much to make a good impression to people who don't even know me?

I can't understand myself, and I just can't shut this feeling. How fucked up must one be to become sad after making a great joke?
Please give me your opinion. I feel like this expands to more areas in my life, and I could benefit from understanding it better.