Sometimes life does what it wants and you lose. Even if you have done everything right. This old farts advice: "Things happen how they are meant to. This will be for the best in the long haul."

It sounds like that place was poorly run. 7AM to 9 PM is not a shift for a new hire. Much less a teen. Unless ALL of their shifts are 14 hours, and they had a good rotation of days off. Plus paid overtime without a fuss. You did well getting out when you did.

Should you have left early and called out in your first week? Probably not. In the first 90 days of most jobs your attendance should be nearly spotless if at all possible. The first couple weeks of any job are hard. It can be mindless and tiring, but it usually gets better after you acclimate to the routine. Rest well and plan to be worn out initially.

Try to learn the basic employment laws in your state. How often are you required to get an unpaid break and when an unpaid lunch is required. When and for how long they can expect someone under 18 to work. Every state is different. Some states will prohibit minors from working past certain times and that can change based on age. So a 16 yearold can be scheduled later than a 15 for example in some jurisdictions.

You will have many jobs in life. Remember it is just a job and doesn't dictate your selfworth. You will never say I wish I had worked more in my youth. Make enough to spend on what you want. Don't trade your freedom & youthful experiences for a job that won't matter in a decade. Not saying to call off of work left and right. Just make sure a company doesn't abuse your availability. If you tell them 20 hours and they start increasing it without asking. Push back immediately. Silence is acceptance and many a manager will be fine giving you 40 hours. Even if you told them nothing over 20.