> I do believe that personality can change

I don't think personality actually changes much, it just has some latent and some manifested aspects, depending on circumstance. In different circumstances it can manifest different aspects. It doesn't mean it changes, just that it can variate depending on context.

It's often possible that trying to change your personality would lead to much suffering, because it's inherently difficult. I read some time ago a psychological study that applied MBTI to cult members. They were asked how they viewed their personality before, in the present and in the future. The trend was to attempt to emulate the personality type of the cult leader. Their happiness was inversely correlated to how much off-base they were attempting to be.