You may feel introverted with the kind of intense choices that could be weighing down on you. Don't forget to include your friends in your thinking. Talk out your concerns with people you trust. You won't have to do what other people tell you to do, but you will feel better knowing that you are not alone! Keep your perspective on these mental and emotional issues by constantly challenging yourself physically. Running is a great way to increase your strength if your knees can take it.