Hmm, in my humble opinion, it might be a good idea to research some more careers first. You don't seem particularly passionate about social work, and I've heard from various professors that social work can be rewarding but that's it a lot of work and very demanding (and that it
doesn't pay well). A "burnt out" social worker is common place because some social workers just get so involved in the lives of the people they're involved with that they can't take care of themselves and just have to leave the field entirely.
And just from some cursory googling, it looks like you might need more than just a master's degree?
Retrieved from:
The 25 Best Online MSW Programs of 2017 | BestColleges.com
Also, have you talked to any career advisors about your humanities degree? Surely there must be
something you can do with it to help you pay for a master's degree?
I haven't looked much into master's degrees for social work, but I have checked out some online master's programs in dietetics/nutrition science and there were some with 6 - 7k tuition. If you worked at the same time, you could pay for that out of pocket easy peasy no problem.