I'm so sorry you're feeling that way. What kind of support do you have now? Do you have any adult family members, doctors, friends who can help? Resources are different depending where you live but if you're feeling lost a crisis line is a good place to start. My local line put me in touch with a lot of great local resources. I found the number for an American helpline that mentions treatment referral and helping you find local resources.
SAMHSA 1-800-662-4357 24/7 (updated with new #)

I would try that first but if you feel unsafe please go to the hospital. Hang on there and if you need to talk to someone I'm here for you.