[Help] Anxiety about work

I had a complete meltdown today. I work as a grocery store cashier and do not like my job...i get very anxious the nights before work. I had a week off for a trip to see family and friends in another state. Tomorrow i have to go back to work and the dread and despair was at an all time high. I feel completely trapped because my parents don't want me to quit until i find another job which i feel like can take a while which has me super upset. I've grown increasingly mentally unstable and i really don't know if the job helps or causes more damage. My parents think that without a job i will have more free time to regress into anxious negative self talk. I've become completely fearful about going into work. I feel like even though most people don't like their jobs there are most likely other part time jobs out there that are less stressful than working at a busy grocery store. My parents told me if i want to i can give them my two weeks notice tomorrow however i worry that my parents are gonna use me quitting as something to blame every time i have anxiety. Do you think i should quit take a breather and apply to other jobs in the meantime? i've worked there a solid 6-7 months. If i do quit how should i word my reasoning to my supervisor? What do you think i should do? I've already applied to a couple different jobs. I feel so horrible right now