Anxiety over looking for a job

Currently I work at a sandwich show and I hate it, or I think I do? I work from 11pm- 6am 5 nights a week for the last 3 years. It's exhausting. I never get a restful sleep. I applied online for a job at a gas station for a cashier. Less than 12 hours later they call and leave a message for me to make an interview. Now all I can think about is how easy my job is now and that I take it for granted, and I have no real reason to complain. I get close to 40 hours and make $13.50, the owner is amazing with giving time off when needed. Neither job is one that I can advance further in so is there a point to even changing jobs until I'm ready to get a real one? I'm so anxious. I don't like not knowing things about a new job and being the new person. I have a routine and friends at my current job. I'm sorry for the rant. I just had to get it out somewhere.