there seems to be no reliable resource for minors. all of them involve notifying your parents in some way or are there just to prevent you from killing yourself. there are no resources i could find, online or in person, free or paid, that provide private care.
You might try this website: https://dontcallthepolice.com/. It lists resources in major cities. I checked several randomly, and all seem to have a “youth” section. When you click on “youth,” you may see resources, or you may see “info coming soon.”
At the top of that page, there is also a set of “national” listings. There are specific resources for abuse, trafficking, and so on. The most promising general resource seems to be https://teenlifeline.org/. I clicked through to that site, and it appears to have the equivalent of a warm-line staffed by other teens.