most of these are specific to my local community (i.e. the Pacific Northwest) but a lot of the organizations have chapters in a lot of parts of the world, so if you're not local... don't sweat !!! these could still be helpful
General
Queer Youth Services: Education, advocacy, and support for queer youth in the PNW
Gay City: The definitive hub for queer people seeking community in the seattle area
The Lambert House: The only social service agency in Seattle and King County dedicated solely to LGBTQ+ youth