"You are either growing or you are dying." was a phrase that I remember vividly almost two decades after meeting Anthony Robbins at the Target Center in Minneapolis, MN. Obviously as children and teens we are growing physically and mentally. However, many people shift their life learning into neutral when they are completed with their formal education.
Colonial Harlan Sanders (the founder of KFC) went out on a limb and started his business at the young age of 65 to supplement his $105 per month Social Security checks. Grandma Moses didn't start painting until she was 80. Google, Apple, Intel, and many others were started by young people with little more than a dream and an undying desire to succeed.
All of the above people are no different than you or I. They just realized that they needed to expand and grow their possibilities. Maybe you could be the next Taylor Swift, the next Colonial Sanders, the next Rockefeller. You just need to DECIDE to do it. Get out of your own way and make something happen!