I Would sit down with the parent that I trusted the most and tell them you need help and you think you may be suicidal. I know it's hard, I had to do it and was afraid. It was a time that I most felt rejected and unsafe. My dad told me if I felt that way tomorrow tell him and all was dropped and forgot. At least if I went to the school psychologist after they would have a heads. The school can force counseling if you need it and your parents won't help you but I would try to keep your health and school separate if possible.