oneplus 9 series android 12

I have browsed through a lot of these posts and 12 definitely is more cumbersome and compartmentalized that it was before, but I guess I have to get used to it. I wanted to ask if anyone else has this concern, because my main concerns with cell phones in general is security. Even with 11, I always had the pocket screen protector button on and I use a lock screen but whether it's pulling my phone out of my pocket or waking up to find that there's sites open, or Google is showing a topic in my search box (ex: the reason I got on this forum this morning is bc there were searches on how to say "hi in Hindi" and I live in VA. And I close out everything prior to going to sleep. Sometimes I'll pull my phone out of my pocket and I'll be halfway through a membership of something. And I have a lock screen, password, so I was just wondering if any of that happens to you guys or what do you do on a daily basis to get rid of bloatwear or update security, do you think McAfee is good, etc? I don't sync any devices but I do connect via Bluetooth with my Pioneer deck in my car, so I'm susceptible to being compromised. But the One Plus 9 was doing this before getting the car stereo and my Default only allows 5-4 G where it used to offer 2,3,4 or 5 based on when it needed. All of those dual and intelligent wifi features are limited. No chance of rolling back to 11 I don't suspose? Gracias