You can change. There's a technique called Releasing outlined by David Hawkins in his book Letting Go. I've undergone a metamorphosis since starting this practice. Not 10% better, but life altering, horizon expanding shifts I never thought were possible for me. It's inner work that resolves the feelings that create your outer reality.
I'm not sure about this recommendation. It seems to be unscientific spiritual / new age 'negative energy' type stuff. If you like that, go for it. Otherwise, avoid.
Looked it up on amazon and the book was free with an audible trial.
Hope it works.
There was one other book, a very short one, it's more like an excercise book really with space for you to write your answers.
Has a very "commercial" title I'd say, it's called
Self Discipline in 10 days.
It's a bit of a psychological rollercoaster and but I did find it pretty effective when I went through it years ago.
It will ask you to write down and articulate your biggest failures fears etc.. Try it out :)