If you're looking at self-publishing (what I did at 14) here are a few companies:
Xlibris
BookSurge
LuLu
Author House
Tate Publishing
Word Press
Book Pros
Trafford Publishing
Createspace
Dogear
Just Google these. Some may not publish authors under the age of 18, though. I used Xlibris. Pricy, but the best quality of the ones that I researched.
If you're looking at traditional publishing, well I'm not sure what to tell you. I was turned down many-a-time by too many publishing companies to count. There is a small publishing company in my hometown called Brandylane Publishers. They are a traditional-style publishing house, though they are very small. A plus is that they're totally free, provide a cover, and provide editing for their authors.
Well good luck in all of your writing. Publishing, by far, is the hardest part of being an author.
P.S. Trafford Publishing is just across the Canadian border from Detroit.