Hip proprioception failure

I am male and i have a pretty bad case of apt. I've been doing exercises for a while but not much has changed to be honest.

As i was standing at my standup desk trying to force my body to be straight i noticed that there is a massive difference between how i feel my body sits straight and how it is actually sitting.

To be more excact the correct position with no anterior pelvic tilt feels to me like i am pushing my pelvis way in front. While what i feel my body is straight without looking iscin fact my but sticking out in the back like an onlyfans model.

Its very hard to teach myself the correct position when the position i feel is the right one is in fact very wrong.