One thing that definitely needs to be stressed here is that going back to school and getting a degree is absolutely no guarantee of stable employment in the future. Even if you study a field with a lot of demand, you might graduate and find yourself right back in retail, unable to find work in a better field. Don't get your hopes up.
Wow, way to take a dump on someone.
You are partly correct. You can certainly get a degree that leads to nowhere. However, there are degrees that are in demand and will get you a high paying job.
Whether the in-demand degrees line up with your preferences is an entirely different matter. And, yet another matter whether you override your preferences to go where the money is anyway. Different strokes for different folks.
However, you definitely need to know that all degrees are not created equal. Find out about the marketability of areas that you're interested in beforehand.
So, yes, do get your hopes up! But, only after you have done your research and know what you're aiming and know that it is marketable. At that point, use your hope and optimism to keep you going towards your (well researched) goal!
Mr Awe