If you don't want children, for whatever reasons, don't beat yourself up. I am a female in my mid thirties who will never have children. I was always honest with my husband that I didn't want kids, and he was fine with that decision. We are also very fortunate that in a decade of being together, our families have never put pressure on us. Yet around 32-33 years old, I became very insecure about not wanting kids. I felt "broken" for my lack of interest, and began wondering if I would regret never having children.. My husband and I were the in the right place to have kids, and if we were going to, we should start then. My husband is a bit older than me, which I allowed to add pressure to myself. I kept the emotions to myself for awhile, but eventually opened up to my husband. His response was clarifying, "If you really want to have kids, I'm open to it, but I don't need for us to have children, so don't worry about me. I'm not hearing you actually express the desire to be a mother, which is the most important part of that decision." Shortly thereafter, one of my best friends became pregnant, and I was thrilled to hear the news. That I felt no jealousy or other complicated feelings was the defining moment that I am not meant to be a mother. Five months ago my husband had a vasectomy, and there have been no feelings of regret. We also started opening up to more people that we are not having children. I'm sure there are some who find it odd, but no one openly shames us, and many are supportive. I think it helps that I am genuinely supportive of them as parents. You won't find me baby sitting, but hell yeah I want society to provide better support to families, kids, and schools.
As to your original question, there are many reasons why I view being child free favorably, including money, but ultimately it comes down to my husband's point: I have no desire for motherhood. I still fear getting old and lonely, and I find it a odd that I lack a desire expressed by most women, but I can't make a lifelong decision to be someone I'm not.