I'm very unsure because I have many very good and very bad reasons for joining or not joining all of the options. I will honestly wait and see what those options really mean. Anything else I say would be head cannon in this case.
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I have similar thoughts and worries.Good point. The game will probably provide opportunities for your character to reject their background values.
The Street Kid who who makes himself or herself useful to the Corpos, even if it screws over the people of the slums, as the best means of moving up in the world.
The Nomad who has grown weary of life on the road and embraces the more settled lifestyle of a Static in Night City.
The disgruntled & disillusioned Corpo who sides with anti-corporate elements either out of a personal vendetta (Corpo V was let go), or because they saw first hand how the corporations are responsible for much of what is wrong with Night City.