I never let negative thoughts get the better of me

A heckler doesn't get removed from the room. What a good comic does is decline to hand the microphone over, and carry on at roughly the same pace.

Arrival isn't the part anyone controls. The thoughts turn up uninvited, often at predictable hours, and turning up is the whole of what they can do unassisted. Getting the better of you would mean rearranging your afternoon — the call not made, the thing not applied for.

So the measure is behavioural rather than emotional. You can feel thoroughly got at and still make the call. That counts as winning, even though it doesn't feel like anything much at the time.