I understand you went through a very difficult experience being homeless, but I can assure you that Google isn’t interested in you in particular. Google casts a wide net when it collects data, having Waymo vehicles and vans following you (or any other single person) would be rather expensive. They collect data on all of us, just not quite as actively as physical surveillance.
I’ve been in a survival frame of mind before and it can feel like the whole world is against you. It’s hard to trust anyone. Living in a car in SF (or any city) would give me massive anxiety, there’s no “safe place” where you can fully let your guard down.
I know you don’t want to hear this, and have probably heard it before, but your paranoia may be a sign of untreated mental illness. Stress can trigger mental health issues, and treatment may help. I also understand that the medications have some pretty bad side effect profiles, and being labeled mentally ill means you get treated completely different than everyone else (in healthcare in particular) I also understand that your experience of feeling surveilled felt very real to you, the hard part of treating the disorders is that it’s hard to accept what you experience isn’t real, since it’s very real to you.
I encourage you to consider seeking help, but understand why you’d be hesitant. Take care.