I hear you. I’m also childfree. The pressure on childfree people is ridiculous. I write passionately about this.
Please reconsider calling yourself selfish for choosing not to have children. It’s not selfish. If it is, then so is parenting. Most people who have children are having them because they want to! That’s not noble or virtuous. So if it’s selfish not to have children, it’s selfish to have them. 😀