Well - it's hard and unpredictable work. A lot of work with no guaranties. As a freelancer, you really have to do some virtual legwork to find paying gigs, until you build up a good portfolio and get returning clients. And you can't be too picky with the stuff, if you plan on paying bills with it. Sure, you don't have to work on things you aren't comfortable with, but you'll probably have to expand beyond the limits of your personal faves. And always learn new stuff - I had to pick up 3d modeling and am currently making background mock ups for games for my main client.
My income doesn't have anything to do with the style or topics of my comic, and I''m not sure when it'll be to any extent - even with a decent audience of 7k of Webtoons and Tapas combined, I had only 1 patron, and they left after 3-4 months. Ad revenue and inks will probably amount to a couple cups of coffee buy the end of the year, lol.
As for your case - I'd say it is way too early to put your financial situation in the hands of your art. You need improvement to be marketable enough in freelance, to be able to price your art well enough to make a living out of it. I do not know your personal circumstances, or the job market in your area, but I also worked in retail and used that time to improve skills and start building an online presence with my art. Yes, it was exhausting, mentally hard, but it gave me a chance to save a safety cushion before I dived head first into freelance. Not having money to pay bills when you don't know when you'll get a next commission is far worse than a 10 hr shift. Don't put all your eggs into one basket just yet, you're still learning how to weave it.