Have you considered that he may not really want these things, he merely feels as if they're expected of him as a societal pressure to "become an adult" and that is how those around him define such an action?
I'm the last male in my line. My family lineage in this country goes back a few hundred years pre founding of the United States. So with me dies a long line of my family tree by not having children. It's actually quite an incredible pressure to have. Now, do I have children because they want me to? Is that the right thing to do?
They always teach you to act like an adult, but they don't teach what it is to be an adult. One day you're legally a minor, the next day you're an adult. What defines an adult? Nobody has told you, so you look around and you see adults. They have jobs, they have houses, they have kids, they're becoming alcoholics because they're miserable. Is that what being an adult means?
So, sure you can expect that you "want" these things because other people expect you to want them, but maybe you don't really want them and resent the pressure from others to do so. So, you do little things to sabotage your success. Things that slowly paint you as unsuitable for being treated as an adult by those who want you do do what they feel is best for you.
Nobody actually ever sits down and says, "You know, it's OK to not want kids, or to not want to own a house. It's OK to want to travel for your job. It's OK as long as you decide you're responsible for you.