Destiny is the past creating the present. You might say to yourself: “I'm just destined to be overweight/unhappy/victimized/destitute/alone forever”, but these are actually the results of life choices you've made. It's never too late to make a change.
Repeating poor actions without considering the consequences causes your body to develop unhealthy habits. However, you are not destined to be anything except what you’ve made of yourself through past and present actions. Many of these behaviors are reactions to past trauma and/or coping habits that don't address the issue.
Each morning when you wake up you make a plan that you never follow through on. Somehow you get overwhelmed, or at the end of the race, you find that you never really wanted the prize in the first place. It's time to breathe, take a look at your life, and see that you're on a course for self destruction. If you have stumbled and fallen you can always get up, dust yourself off and continue on a different path. No matter what your present state is, you can change through self control, discipline and altering the way you think.
There are many examples of great men and women who have overcome their personal demons. In his youth Mahatma Ghandi had tremendous anger management problems, prior to his renown as a pacifist, he was actually a very violent man. Terry Fox overcame amputation and mounting health concerns to run his marathon of hope. Usually those who achieve great things also suffer great failures, but they refuse to be trampled by them. You don't have to achieve your country's independence or run across the country on one leg; small steps can turn your life around.
And if you're still having trouble changing your thoughts, check back next week.