The difference is 'Family'. Inevitably you will need to have a partner and say, four children, for the human race to survive. At that point you have to go the traditional route.
Houses these days are unnecessarily large. My parents live in 6,500 square feet, and they're empty nesters! I guess that space makes a lot more sense be because they live in a suburban hellhole where there are no public spaces and every excursion outside is a half-hour car trip, one way.
No, you personally won't. Plenty of people go their entire life without raising children and yet the human race continues to grow.
And there's nothing stopping you from raising a family in a small space. My family spent 6 months in a ~700 sq ft apartment in Chicago when I was growing up.