No? Maybe people are funny because they like to make people smile?

well thank god im not funny

at least you're honest

Sometimes. I'd say I'm funny but I'm nowhere near sad.

Or to mask their pain with laughter?

that could be true for some people but I generally don't agree with the statement

Hmmm... this could be true.

In my experience, the quieter the person is the sadder they are.

No. This isn't true for me. I'm almost never sad at all

Because no one in this world can actually be happy, right?

That's true, although there are also people who try to hide their sadness by being overly outgoing.