If you don’t think that men deserve your children and your labour avoid getting pregnant for 20 years then you’ll age out and escape the matrix. You don’t need to make a decision to not have children and keep defending your decision, just avoid getting pregnant. Say and do nothing and you will never get pregnant. Sabotage any chance you have of getting it pregnant. By just avoiding pregnancy for 20 consecutive years and you are done. An entire lifetime. No pregnancy. It’s really easy actually. Never get serious about any man. And make sure you don’t get pregnant. Then chalk it up to waiting too long to get pregnant and act like you really regret not having fees to pay! 
.Act miserable once in a while. Don’t rub the advantages you have, in parents faces. Enjoy quietly and pretend to be like them. Ask about their kids and talk about them like you are a parent yourself. Talk about how hard you tried to get pregnant - by avoiding it for 20 years then going for IVF and dropping out before you even started . If you don’t want to do something all you have to is keep putting it off every chance you get to do it. Do nothing about it. Also don’t look too happy, you are not supposed to have any happiness if you don’t have children. You are supposed to suffer and be depressed so don’t flaunt your happiness from having no responsibility and all the time to do whatever you want. The easiest way to avoid doing something is to keep putting it off. Not fighting the status quo. Defiance can be as simple as quiet resistance via avoidance and feigned procrastination. Don’t fight. Avoid doing anything!