If you assume responsibility for your personal health behaviors then you are more likely to maintain good behaviors. If you don't then you might tend to follow lackluster health behaviors. Think about it like going to class. If you hold yourself accountable to do the work, then you will most likely succeed. However, if you don't hold yourself accountable you most likely won't care what happens.
First, you have to know that dropping out at highschool can make finding a good paying job more difficult, unless you have a valid certificate. I think that you can become this way a: