I need help determining if my work place stress is normal.....

I took this job 1.5 years ago. It pays alright and was in the animal field which I love. It is my first real job after college.

I took this job as a 9-5 job with the realistic approach that every now and then I may have to put in a few extra hours just like most jobs.

It has turned into I am essentially on call 24/7. I am in charge of an entire start up business by myself. Accounting, marketing, facilities, you name it. It is all consuming.

It keeps me up at night

I keep putting in extra effort and it isn’t paying off. I often have to drive places with no reimbursement and when asked they said it’s just “part of the job”

It’s hard to put into words but over and over I feel as if I’m bending over backwards for nothing..... is that normal? Am I being too dramatic and this is how every workplace is?