OP..
There will be adults who will not be married nor get married throughout their lifetime. There will be adults who will not have kids throughout their lifetime.
Granted, those who fit the aforementioned are a minority, but they exist.
As for them being social outcast, well...
Let me ask you this..
Would you want to be around ppl who would mistreat you based on your lifestyle choices??
The only thing that should matter is you and yours along with those who choose to deal with you. Everyone else is whatever.
My thing is this..
If you gonna have kids, then be married first! Don't have kids out of wedlock! Give your kids a shot to be born with two married parents in the household.
Maybe the legitimate child(ren) will have a good chance of growing up to become well adjusted and functioning adults while living within their formative years as a well adjusted and functioning child(ren)..
Lastly, should you decide to marry and have a family, your friends and family will naturally drift apart with exceptions.
But, at the end of the day, ppl should live their lives as they see fit. Bump what other ppl outside their social and family circle have to say about it.
Less ppl in your life the less bs you have to deal with, so...*shrugs*