Yea I mean I can see how it sounds selfish not producing a family of your own. (our parents want to be grandparents, etc.)
But really there is no law that says we need to raise a baby. I mean that is not only a complete life overhaul, it is very expensive
Selfish is doing things simply to satisfy your own self interest with little or no regard to others. If you have the means, will and heart felt desire to bring another person in this world because you sincerely believe you can provide that new born with a wonderful and good life as well as someone who will make this world a better place then that is not selfish. But so many, or most, do it because of familial, societal and cultural pressure as well as a desire to feel fulfilled and complete -- even needed.
And again, as far as marriage here in the US. There is no up side. Anything that you can do and have while being married you can now have being single and having a "life partner" (including experiencing love, BikiniSlut). Other than societal acceptance and tradition I can't think of any advantages anymore. I can think of a host of disadvantages. It's not a coincidence that more and more men are choosing to remain single. And being married, especially today, is nothing to brag about or believe it puts you on some higher moral plane than a single person.
And I can point out several men (and women) that I know personally who are quite lonely being married. In fact, they are made more lonely being married. Their union is essentially another roommate that they live with under an unspoken and precarious detente and any social life outside the home is looked on with grave suspicion if not out right hostility.
Loneliness is a state of mind. Many are quite content being by themselves whereas others can be surrounded by people and still feel lonely if there is no emotional and psychological connection. We live in a more crowded environment than ever but there are more lonely people than ever before.