To outside observers, I was a fairly spoiled kid. I didn't have any jobs in high school, and I had a light load of chores. It's not that my parents were particularly wealthy, but I pushed back hard and was generally difficult with them, for the sake of preserving my study time, my free time, and getting a good night's sleep.
But it paid off. I got a scholarship, and went to a state university. Classes started a few days after I turned eighteen. I went out and got a part-time job immediately to pay for living expenses. I worked hard and did my job well, graduated, and landed a job that paid better than my parents.
From the get-go, I was a serious worker who put everything I had into the job while I was on the clock. I'm still that way today, and I find that people are either like that or they aren't. I find there's no correlation between the people who had jobs as teens and how serious, responsible, and industrious they are.