This isn't always the case, Esther. If not like you rightly asked 'why do bad happen to good people?'
Even when you've become what you hope to be you'll still have people who do not align with your path try to shoot their shot.
Also, while the idea of working on oneself is good it can become a form of self sabotage. It can become a breeding ground of never being good enough. Do you get my point?