People say I should talk more

I was always the silent type and often felt a bit down. People around me often think I should talk more. They tell me I will feel better.

I try it, but my mood doesn't get any better. I feel guilty about that. I feel like a clown performing a trick.

Those people mean well, so I don't want them to take it wrong. But it makes me even more depressed. How to get out of this?