First thing if your not of low body fat lose some weight, it’s common sense that any extra weight is going to exacerbate the problem.
If you can be arsed to do that then next step is to learn to hip hinge, stop bending over and grinding away those bones.
Next step learn to deadlift and squat correctly, watch hundreds of youtube videos and get a trainer who knows what he/she is doing.
Strengthen those spinal erectors, if you do these things you will eventually improve significantly.
This is not really a problem of the body, but a problem of the mindset.
Get yourself a plan. Execute said plan.
I am in no way qualified to give advice of any kind, but i do have a core of steel.