I laugh when it hurts

Seldom
I'm talkative.
Frequently terse.
I've never been good,
but I used to be worse.

Always
I'm thinking.
My cognitive curse.
I've never been quiet;
I used to be worse.

You
go ahead.
I don't want to be first.
Frequently hiding.
I used to be worse.

Can't stand the water.
I can't stand the thirst.
I'm frequently vacillating.
Used to be worse.

Seldom
I'm talkative.
Loquacious in verse.
Always repeating;
uncomfortable first.
A bit unexpected,
I laugh when it hurts.
Don't tell me you're serious,
I'm just 'bout to burst!

Yes
I've a meanstreak.
I know where it hurts.
I'm pulling my punches;
don't want to get worse.

A bit unexpected,
I laugh when it hurts.
I've never been proper:
I used to be worse.