How do i get help for this depression?

I don't know how long Ive been depressed point is... its been a long time... and lately its been getting worse.. yesterday i couldn't help myself but cry... I'm 16 and next month is my 17th birthday and I'm terrified that no one will remember. I took the Goldberg scale test thing to make sure that i wasn't just having an off day. i got +54 severe depression... the point is... I'm not close enough to talk to my family about this... no one knows exactly how sad i am.. i want help i don't wanna cry all the time anymore... basically... how would i get help for this.. what would i say to my parents.. im confused and i feel really alone...