>I’d like to do that not because I feel responsible for climate change, inequality or whatever, but for personal security, longevity, and quality of life reasons.

Yes, the individual is not separate from society.

You cannot separate climate change from your "personal security, longevity, and quality of life". They all depend on the climate not changing.

And yes, you are in a trap. You are unable to escape your conditioning. You could live the way you want right now. It will be hard, but you can do it. Lead by example and all that....