Automatic logins are easily automatable to steal data from my device, me, and the people around me. I want to be asked every time a service wants to know who's

Automatic logins are easily automatable to steal data from my device, me, and the people around me. I want to be asked every time a service wants to know who's using it from my device. I want to have the option to immediately decline authorization before any information about me or my device is sent. I want to have the option to say "no, I don't want this service to know it's me". I also want the option to say "I am <soandso>" even if really I am not <soandso>. Not giving me that option is a disrespect of me as a user.