One of the keys to success is passion. If you care about something or want it naturally you won't need to force yourself to work on it. The passion will be your fuel. Only work on things you are passionate about.
My family told me this weekend that I will never reach my goal, then said "you're a fat ass now, and always will be". Well, this is what I have to say to you. I can do it! I will do it! Nothing else is an option