I turned 33 a few months ago and realized I was the only person in my family over 30 who isn’t married and/or has kids. Most of the people I know has kids and/or married.
I am a man and I get asked about my relationship status often. Why don’t you have a girlfriend? Is that girl you are with your girlfriend? Are you gay?
I am childfree by choice and get even more questions. Why don’t you want kids? What does childfree by choice men? Are you a virgin? How do you have sex if you don’t want kids?
One of my best female friends is 35 and it’s terrible that’s all most people care about. They don’t ask about her job, hobbies, etc.
Why are people so worried what other people do? I don’t go up to parents who have 2 kids and ask them why they need more than one. I got used to the questions by now and sometimes I try to embarrass people when they ask me.
People can be really judgmental and plain rude. I have lots of friends who have no kids and are in their 30-40s and that’s by choice. Not everyone wants kids or multiple kids. People need to respect that. I always get asked why I don’t want more kids. What I want to tell them is “because I don’t; mind your business.” 
Not sure where you live, but here in the DC area there are a lot of people in their 30’s, 40’s and beyond who are single and child-free. I know several and we talk about work, travel, shared hobbies/interests etc. I think it’s harder in small communities where there are not as many singles.
I have family and friends who never married or had kids, and they are in their 50’s and 60’s. They experienced similar questions. I guess people are curious about things that frankly are none of their business. You don’t owe anyone an explanation.
The OP is no longer active so closing thread.