Hello and welcome to Psych Central! Easier said than done, of course--but try to take things one day at a time. As you can see, thinking too much about the future can make us anxious and prevent us from staying in the present and getting what needs to be done then. I know how that is from personal experience!

You might see about making an appointment with a counselor at your school, who could listen and maybe help allay some of your concerns.