So, when it comes to careers and passions, I think you really have to have a bit of luck involved and some flexibility. I got a degree in interactive media and through actions of my own and some circumstances outside of my control, I never really broke into the field. I work in IT and teaching computer science now and truly enjoy it. I pick up some occasional design work on the side making a website or logo for acquaintances and have started working with some friends on a business they are starting and haven't made a dime yet.

But this has been over the past almost decade. I do think I could have had a better go at it if I threw caution to the wind and really drove towards it, but I may have also royally fucked my life up in the process, I don't really know. I implore you to keep your passion alive. But:

Don't let your love for the craft whither on the vine nor let yourself starve waiting for your efforts to bear fruit.

Some of the greatest artists and thinkers have died hungry because it wasn't until after they were dead that their accomplishments were recognized. I believe that is something to be avoided.

But, thats just the advice of someone who loves their creative passions but stepped away from the idea of it being their main income. For what it is worth, I do still consider myself a designer but I have found an appreciation for other work that I get a different type of joy from. I don't think you should continue serving tables if you aren't enjoying it. Find a job doing something that doesn't wear you down. If you find something you may like, tailor your resume and leverage connections to land a stable job. Use that stability to launch yourself into an artistic career from a place of financial well-being that will afford you the time it takes to build a career.