The good thing about being seventeen is that you are old enough to legally seek psychiatric treatment by yourself. Do you have transportation? I would call your insurance company and ask for referrals. Alternatively, make a GP appointment and ask them.
Of course, my first line of action would be to talk to your parents. Tell them what you told us here. Maybe if the hear how much you are struggling they would be less likely to brush if off. My parents (way back when) minimized all of my symptoms and behavior and I turned to self medicating with drugs and alcohol at a young age.
Good for you for being active in seeking help. You have so much life to live, and it will be soooo much better once you get yourself some help!!