I am tired when I get off work and re-tired all over again when I get off the next day!! I started preload at 18, went driving pkg cars at 23. I am 41 now and feel like I have been kicked by a mule for the first 10 minutes I stand in the shower every morning; I spend a lot more time stretching and popping than I do bathing! I am out on workers comp from a wreck I had 14 months ago, takes a long time to heal after 23 years of UPS. I believe the 5 years I spent on preload did more damage to my body than driving. If you can, get one of those cushy reload jobs at night, those guys have it made compared to preload. Sounds like you are a go getter, management will just love you! Maybe after driving a while the management bug will hit you again, thats where a lot of our go getters end up, and might not be as stressful as owning your own business. I say hang in there, good money, even better benfits as long as you stay healthy.