I agree with all of the above advice-although I'm biased as well, being a graduate of GMI/Kettering (BSMSE-'92). It's a unique program, and I benefited greatly from it. Matt's advice is well heeded as well, as I still needed to network and have the guts to ask for a job in the old car industry. You have to guide your career and make opportunities by meeting people and learning skills. Many folks have aimed for a career in automotive industries (or aerospace or other tech specialties) and ended up with safe but lackluster careers in specific component production, or "quality assurance." I worked for a medical device company during my stint at GMI, but most of my school friends working for the car companies ended up in groups designing seatbelts, or manufacturing taillight assemblies. Not that these things aren't important or noble, they just weren't my idea of "fun with cars". Even if you get into one of the car companies, you still have to use networking and opportunities to guide your career through the company. Only a few of the many workers in GM or Ford get to build the dream cars, and those who get there usually didn't get there by chance.
But you have to believe in the dream, and yourself. It is all attainable by regular folks like you and me. It won't come to you, though. You have to go and get it.
Try to distill your interest into what you want to do. If new car development seems the way, Kettering and others are great. If old cars are your passion, several colleges are offering excellent programs in auto restoration. If fabrication or custom bodywork are your bag, don't rule out many of the excellent tech schools out there. You have options, just focus on what your personal strengths are and what you enjoy. If you do what you like, you're more likely to do it well and the day sure goes by a lot faster
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Don't let it overwhelm you - its nice to get on track early, but you will always be able to make new opportunities if you find yourself on the "wrong path".
Best of luck to you!