Yeah I went to college and became a PE teacher, so I take a little offense to that. Now I didn't go to college to become a PE teacher. I majored in something else entirely, but I ended up growing into that profession. And no way would I have been able to do what I do now if I had not received a degree first.
Sports medicine just seemed like a slower and more calm environment than i wanted. Also, early in college, i worked tutoring and coordinating sports programs for kids. It showed me first-hand how lack of education/understanding is the main cause of obesity. Overall, i realized teaching people about fitness and health would be more rewarding. I also like to work out myself, so I help myself out, not just others. Plus, if you're well rounded, you can incorporate injury prevention into fitness anyway.
Go talk to an advisor if you want to do sports medicine, because kinesiology may not be the best route. I have some athletic trainer friends and I don't think any of them majored in kinesiology in undergrad. A lot of schools actually have an "Athletic Training" major, so look for that -- I'm fairly sure they offer that at UH. At the very least do some sort of Physical therapy, but I don't think kin is routine way into sports medicine. Again, talk to an advisor.
No worries, I'm sure you didn't really mean to offend. But yeah there are countless people out there who go to college specifically to become teachers. Because again you can't expect to teach anywhere unless you have at least a Bachelor's degree and a certification in your specific content area. I actually have a cousin who majored in Kinesiology and went on to get a Masters in Occupational Therapy. So it might serve as a springboard for you into the career path of your choice, but as others have said, talk to an adviser to find the best route.
