If you haven't already decided on a career, look at being a mechanic, engine reconditioning or mechanical engineering.
All 3 will give you different views and levels of knowledge (eg, mechanic is general for the whole vehicle, reconditioning will teach you engine specifics, engineer can design stuff).
Or.......find something you love doing, hope its a well paying area and pay someone else to build the car for you.
After 20 years of mechanicing, I've lost the passion for working on my own car. It may be different if I had access to a hoist, but it is what it is.