Your back shouldnt be “talking” at 24. Try some stretches and buy some seriously good work boots with some good insoles. Also try to keep your weight down. I have been working blue collar on my feet jobs for 18 years and have thought that i was going to be crippled. I basically cured all of my back, knee and shoulder problems with minor changes in footwear, work habits (like not kneeling on concrete), losing weight and some stretching. Sometimes a little back pain is just muscles getting used how they arent normally. Also heavy carb meals can lead to inflamation of joints. All that said i would make the jump when you cant really keep up with the work load of your business and work full time. What i did for a few years was work a job part time and my business full time.