To start with, just remember to stay safe when you're using equipment like that. If you need a 5 minute break, take it, because mindlessly operating without paying attention can lead to bad, bad things.
Now...
I don't want to sound like an a-hole, but... man up. Working a deli counter and the pizza ovens isn't too bad of a gig, especially after school and on the weekends. I imagine you're probably working like 2, maybe 3 days a week? Well heck, that's about $130 a week. I'd imagine that's cash-money as well, right? Not bad.
As far as turning in the boss - why would you want to? He's giving you work, at a wage that doesn't suck, you're learning some skills that might be useful to you later on. Especially if you're working with cash and what not.
The alternative? I hear the library is just dying to hire someone to mop the floor for 8 hours a week. Now that's a transferrable job skill.
You're a dude, dude. Electric food slicers and mega-hot pizza ovens are in the "cool stuff" column, not the "OMG I'M TELLING!" column. That's the kind of job kids your age should want - not some crap supermarket job, walking around with a price gun, stocking cases of oatmeal. What the heck is cool about oatmeal?
Learn to enjoy what you do, have some fun with it - maybe your boss will even start to treat you better if he thinks you're into what you're doing.
Sincerely, the old man down the street... now GET OFF MY LAWN!
Hmm $130? try $82. The reason I was going to,"Turn him in" was so the next kid doesn't get cut. And before you say it, yes I know 82 bucks is good pay for 2 ~7hour days.