Overcome your social anxiety
Did you know that about 15 million Americans suffer from social anxiety and that the onset age is typically 13 years old? While social anxiety disorder can be a serious condition that sometimes requires counseling and medication, if you have mild social anxiety, a great resolution would be to do things to try to overcome it.
An easy way to do this is to join a sport or club that intrigues you, so you can meet and make conversation with people who have similar interests. Most schools have clubs and other activities going on all school year long.
Save your money
Teens always need money, whether it's for school activities or just hanging out with friends. In the new year, why not pledge to do a better job managing yours? Save your change when you get it, and spare some cash by downsizing that extra-large shake at McDonalds. If you're 16 or older, you can even get a job if you want.
Improve your grades
Good grades are important in high school. Set aside time every night to do homework and study. If you are struggling, ask for help at school or home; there are tutors online and at school.