dont take this wrong, I have hired quite a few kids and trained quite a few kids in the past heres the best advise I can give you.
LISTEN AND WATCH keep your mouth shut about what you know,how it works in MC or on a pc or what you can do in MC or on a pc.
Nothing will get you fired faster than a know it all kid especially one who has never run machines but thinks he is a programming whiz.
I have had a 12 year old (my daughter)that could run smartcam and actually make workable programs, She learned the program faster than I did. at 10 she could program hitachi lathes in the multiseikos control from a blue print, she was actually doing it when she was 6. My youngest is 9 she is playing with bobcad. I bought it it sucks so I dont use it, its on an extra pc.
What I am getting at, is kids are smart as crap on computers and programming you learn quick, however there is NOTHNG that replaces machine experiance. the best programmers in the world that have no machining experiance are USELESS in a job shop.
at your age hopefully they will teach you how to run a hand lathe and hand mill, that right there is the best experiance you can get, if they offer it do it, do it before you ever touch a CNC in 2-4 years you will think back this guy on cnc zone was right.
Learn everything you can that has absolutely nothing to due with CNC's or computers 1st. learn trig, learn how to set up and make fixtures. when you do run CNCS learn everything you can from set-ups to figuring out how to cut a part( this is were the hand machine experiance comes into play)
I know the big thing is running cnc's its not that big of a deal trust me, you just push a button and thats it, ANYONE can do it, if you learn the manual machines(if given the chance) thats were your experiance will come into play, then you can be trusted to play with a 80-200k cnc machine.
some of the kids that I worked with back in the early 90's are pretty damn good machinest they have very good jobs today as programmers and one is even running a very big shop. When I hired him at a old shop I worked with for a summer job I made him run hand machines for ever he hated it and hated me( but he needed a job) A few years ago I ran into him and he told me what he was doing and who he was working for. I was pretty damn impressed cause I figured he would have dropped out of the industry myself.
Remember employers know what they want new hires to due, The dont want to be told me an employee what the Employee wants to do. liten to them as most shop owners are very smart people and you can learn alot from them. Hit up the old guys while there a tad stubborn and can be real pricks, they been around for a long time and you can learn a ton from them, same with with inspectors, these guys know parts learn every inspection technique you can, all the old school formulas etc etc..
Good luck with your job