It is very difficult to earn living only with bitcoins.
Firstly, bitcoins are accepted everywhere and you can not pay all your expenses.
Secondly, no legal way is possible to earn that much only with bitcoins.
you are right. very difficult to build a life with only bitcoin. but there is no way to build a life with bitcoin, is that you must have real jobs that can add finances to remain stable.
Real jobs really brings stability in life which is hard to find in bitcoin,bitcoin is only good for short term profit so real job is needed.