Honey, I had this type of struggle not long ago.
A sort of survival reaction causing to close throttle and go lightly on brakes, but I didn't hear voices! (joke)
Is that feeling or "voice" something like "I don't want to be here and "quit" by closing throttle", sort of uneasy feeling you have on passanger seat of a car when driver goes too fast for your comfort zone?
Main problems/solutions for me were:
a) Vision problem: Focusing eyes too much on brake marker and not able to see/process how the corner sweeps. Solution: As approaching the corner I try to get wide "bird view" through the corner, turn head and no much eye focusing jet, center of the vision much inside of the corner (towards corner exit!).
This way approach speed feels 2x less, able to stay calm. A fraction before rolloff and brake I lock eye focus on inside curb, important, because that is were you need to drift to. You catch rolloff and brake markers with peripherial view.
Tips from former world champ.
b) Action sequence problem: Braking, then quick turning too late. Solution: I as beginner was braking and started to turn almost then braking was done. My turn-in points were "racecar" points - too late for superbike and needed to slow down too much to be able to flick and make to the apex.
Solution: A good instructor identified it and made it clear to me: Start turning somewhere at the same time with braking, some steering handelbar pressure with brakes long before corner starts to turn, with strong brake the bike does not lean much and even with some 20deg lean the bike does not drift much to inside jet.
With regard to our fear problem: This creates safety as you are early executing actions of turning in and braking errors I can catch by running wide and not braking straightup into grass under panic.
c) Simple fear problem. High speed, acceleration, noise, vibration, wind and corner shooting into your face too rapidly can trigger survival reaction for an non-advanced racer.
This was issue for me, but dissapeared over time completly. I think strong acceleration is the main player here. Like Lanister said before try slow roll-off. I would say try rolling off 50% well before fear would trigger, bike maintaining speed and not accelerating anymore, now try to dance, shake your shoulders and joints. If you are able to do it then you are relaxed enough to sense speed, process visual and execute actions.
Coasting a second or two at 50% throttle, but hitting correct brake point is much faster than ripping out last bit of acceleration and overbraking.
Gen4 race: high spec.
Suzuki GSX1300R Hayabusa 2013: stock.
Kawasaki KX450F 2016: love it.