Thanks, that's useful advice. Googling CNC machine, I see that I can download software for some models to tinker with, to see how difficult that might be.
You may want to look into whether your state has a Dual Enrollment program. Many states, such as Michigan, allow students to complete their coursework at a University or community college of their choice while enrolled in a high school so long as the curriculum meets certain guidelines.
I got bored of high school my Junior year, and I spent my senior year at a community college. It wasn't that I disliked high school, I just sick of putting up with the other kids.
The upside of dual enrollment is that the state pays for the credits, which ends up drastically reducing the cost of your college degree.