I was 12 when I started babysitting. I charged twice as much as everyone else ($1/hour) and I had a lot of clients. They liked that I played with their kids until bedtime, fed them dinner, cleaned up after us, and if the children were old enough, I taught them how to read. I had a great time with those kids.
In high school, I got jobs, in addition to babysitting when I had time. Burger King, Chick Fil-A, a teen clothing store for teens whose parents had religious objections to them being in style, the book department at a department store. The department store job was my favorite because people always wanted suggestions and I always had them. The clothing store was boring because I spent half my time unpacking and putting out stock.
Chick-Fil-A fired me because I didn't smile enough for no reason when the mall was empty. That is so weird, expecting an employee to stand at a counter, smiling at nothing. Also, I suspect I didn't fit in. It was like Stepford employee time. I am friendly, work hard, and smile at everyone -- but I didn't do it right. They are still my favorite restaurant for Chicken Sandwiches though.