Schools always overemphasize the need for high grades. I knew plenty of friends who received at least two D or F's on their report cards and still managed to get into a good state school. You can always retake classes if needed, and dont be discouraged if your first year starts off bad. Don't forget, schools also like to see extra circulars such as sports or clubs so those would be a big bonus for you especially if your a little weaker on the academic area. You still have a lot of time to catch up your GPA but it is good that your thinking ahead. Just don't let it bother you too much! Ask your teacher for help