You will be fine. You don't seem like someone who can't talk to people. 
What if you can't afford to work for free?? I have a full-time job now but would LOVE to get a job in cake decorating. I can't quit my full-time job though or volunteer during the day - or even apprentice during the day. I mean, I could certainly come in from 6:00 - 10:00pm each night, but I think most bakeries are done baking/decorating during that time. Things usually happen in the mornings. So what could I do???
Does your school offer any work/study programs or a "technical"area of study? Many schools in Ohio offer a program through the local high schools that help you get a jump sdtart on culinary programs as well as things like auto mechanics, ect... It is like a trade school. Hopefully you can get some help if you speak to your school counselor.
Best of luck to you.
Tracy
I used to work in sales and marketing so I am very (a bit anal) about being professional in a workplace situation so I'll offer some suggestions.
You can put together a resume that highlights what you have done culinarily ( 
is that a real word??). Create a small portfolio to show your work. There are lots of styles to resumes. Find one that fits your needs. Highlight your other strengths like perfect attendance at school, good grades, etc. Be creative but professional since you are still in high school they aren't going to expect you to have 10 years of work experience under your belt!
I would definitely wear a suit if you have one. You can't be faulted for dressing too professional but you will definitely be faulted for being too casual.
Go into the shop of choice and ask to make an appointment with the manager. This way you aren't trying to take up their time as a walk in but they might be able to go ahead and see you right then.
Bring your resume and portfolio with you just in case they do see you right then. Nothing looks better than being prepared!
Good luck!
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