Find a professional and be completely honest with your feelings. Acknowledge that you have profound anxiety that can get better with talk and meds. Don't worry too much about your grades as too much pressure is already put on teens to get great grades. Grades go down and they come up - accept the process without beating yourself up. You're 17. Life is supposed to be hard. Know that it's only a phase. Trust me, if I got through that time, then so can you. You sound sweet and sensitive. I bet your parents are proud. Give yourself some room to feel bad, make mistakes, and learn from your experiences. You will get through this and eventually help someone else - I can feel it. Believe in you. Life is full of options especially as you get older. Be patient as life WILL get better.