Just Being vs Not

I seem to have exactly enough to maintain a mediocre and lonely life. I’m pushing 40 in retail. My health level leaves me exhausted all the time. This could be the state of my life for another 30+ years and that depresses me to the point of considering the alternatives. I could work hard, go back to school but I honestly don’t think I have the energy. Then there is the other option. It starts to look more and more appealing each day.