Looking at starting over

I've been in customer service since I was 15. Last 3 or 4 years. I've been doing more of administrative work. Receptionist and what not. I had kids young and I dropped out of college. Been working dead end jobs ever since. Usually two jobs at a time. Still making barely ends meet. Raising three kids on my own. It's been tough but they're all growing up and I'm tired. I want something more. I've been thinking about it for years about going back to college, but with the way the economy is and the way the world is going, I don't know if it's even worth it anymore. Do people still get careers after going to college? Is it worth the debt? If you were to start over and you were able to choose a career to go to school for. Don't want to go for 10 years but like maybe 2 to 3 years... Something with good hours and decent pay... Something that won't be irrelevant in another few years.. Completely open to really anything because my life has revolved around my kids and I have no idea what I like. I have no idea what my dreams are anymore. Other than to stop scraping by and to be able to work a single job and still be able to live my life decently.. What would you go to school for?