Being afraid is okay - maybe even helpful. It can motivate you to action. Don't be discouraged if the first person you ask doesn't know the answer and has to refer you to someone else. You don't have to know everything immediately. Now is NOT the time to alter your eating habits drastically or to go on a diet.
Good nutrition is important.
Utilize the Health Center services to stay healthy. Get plenty of sleep. Don't rush around too much. Reaffirm any beliefs in which you have faith. You don't have to throw away everything and become a completely new person during the first month of school.