How to live comfortable in an over populated environment?
Now problems and many people and even the young are interested in survival in the wild . For example in Siberia or in the forests of Canada. This is now a very popular movement and you can read more about it.
Forget it. The people who own the planet have already claimed the millions of square miles of those kinds of places and let plebs go there only in very controlled conditions. Mostly to work on resource extraction for them.
The plebs home is the 'human habitats'. That is, a 24 m^2 chunk of floor area usually between 5 and 40 meters above the surface of the earth. You can rent it. If you have no money it will be subsidized. You don't get to own it, or really anything else because...you know...24 m^2 allotment.
Note that as a demonstration of the infinite kindness of our wise earth-saving leaders you will have some greenspace in which to walk with 'doggie reflection pools' for your dog. You can (for a energy credit deduction) have a small pet of some sort. Obviously you cannot have a human child.