i know people say don’t quit if you don’t have a job lined up but i mentally cannot take it. i need some advice

all i see are negatives on it, i’m 24 and I live with my parents and have savings. of course the (shitty salary i have) steady income will be tough to not see, but i’m more scared of having a resume gap and not finding something. i wanted to use my savings to get online courses/certifications with my time off. help.