hi im 14 years old and looking for a free summer internship in Michigan at a bakery or cake place i live in Detroit for more info on me send me a email to firstname.lastname@example.org
You would probably do much better, showing up in person and making your request. It demonstrates your initiative to show up, dressed as if you are ready to go to work.
I don't live in Michigan, but I'm very impressed that you are looking for an intership!! Like JoAnn said, maybe you can got visit some bakeries/cake shops in person -- just put your best foot forward and you will be great! Best of luck to you!!!!!