sorry you gotta go through that. You don't deserve it and I hope you have other people in your life you receive decent treatment from.
I grew up with very abusive parents and it's just wicked how the ones who are supposed to love and protect you can be your worst bullies.
Keep being a good person and hang in there.
i have done this several times just tell the dealership or private seller i want to take the vehicle for a used vehicle inspection and never had and complaints. Saved me a bundle once when a guy was selling an acura loaded with aftermarket mods that drove like a champ for a great price. Mechanic found that the frame had been damaged and rewelded. Mechanic told me he wouldn't put his kids in it so i passed.