I am very satisfied

So I am really having major issues at work and I’m thinking about quitting my job. I became an HVAC technician a few years ago and got my first job as an apprentice. I mostly fix and install gas furnaces for customers and sometimes work on forced air HVAC systems. I was really excited when I graduated from my program to be an HVAC technician, but now I’m not so sure about that. The problem is that my boss is really terrible to me. He makes me work long hours without any overtime pay. He also gives me the worst and hardest tasks during our furnace installations. I never get to do the fun stuff and I’m not allowed to talk to the customers. I rarely get a break during the day and only 30 minutes for lunch. Meanwhile, my boss is on the phone the whole day and sometimes I catch him playing games on his phone while I work. He takes one hour lunches every day and often leaves early to pick up his kids from school. I can’t say anything or ask for a longer lunch because he’ll yell at me and threaten to fire me. This is not what I had in mind for my first job. I know I am low on the HVAC totem poll but this is borderline slavery. I would like to eventually start my own heating system repair business but I desperately need more experience first. I know it’s better to just stick it out for another year so I can continue to learn, but I am miserable. I don’t know what to do.

air and heat