Some of my first few part time jobs were as a cashier and enjoyed it some and was a waitress as well. Also worked in an ice cream store, frozen yogurt store, delivered meal trays in a hospital, worked in a college cafeteria on Sunday brunch and was at the waffle making station, and delivered dinner plates when worked in catering department in college. Some of those jobs were really kind of fun. What is stressful about say waitress is when a customer complains about the food and you are not the cook, just the food server. When had professional job and earned decent living, social anxiety or plain anxiety caught up with me and now have a job I like thats better for an introvert.