Why doesn't everyone laugh when I tell jokes? I'm serious. Everyone laughs.

When you are serious, everyone is laughing, not at jokes, but at you, specifically at the cold jokes you tell, and at the state that everyone doesn't respond after you finish the cold jokes. It's okay, don't take it too personally, let everyone smile and it's over! There is no need to get upset about such things. After that, it's over Go to bed early. It's very late now.