Impossible Goal

I have yet to set my impossible goal. I understand how to set it to be specific and measurable if it is income or weight related, but I am unsure of how to set it when the impossible goal is how I feel. I have been immersed in the self help industry for 15 years and I still feel negative and weak so have this belief now that I will never change. My goal is I want to feel strong mentally, emotionally and physically. I truly believe that if I can do the work there, the rest (business, finances, relationships) will be built from a stronger foundation and be easier to navigate. Any insight or advice? Thanks!