I talk to myself. An unhealthy amount. I try to keep it to times

Just take note of it when you do. Keep noticing it. You'll stop.

Meditation

My brother (used to) do that even when not alone.
I do that too but not yet when I'm not alone.
I know that the reason behind these actions is that we ask ourselves too many questions, like whether this was a good or not decision.
I'd advice to not turn to the past or future but rather the present. And if you can, shut your brain or let it do the reasoning without words.

Everybody talks to themselves just keep it in your head if your concerned

Meditation clears the mind.

>>16917987
Stick an earbud in your ear and run the wire down to your shirt pocket. Then everyone will assume you're on the phone.

>>16917987
I started muttering "kill yourself kill yourself kill yourself" "you're worthless" or "you fucking suck" etc when I was 100% sure I was alone and eventually it accidentally came out in public and I couldnt control it

no idea how to stop it I still do it