You didnt mention children, so im assuming you dont have any. If so, keep it up. Staying child-free is likely the most effective personal decision you could make to reduce your environmental impact. Obviously, that doesnt mean you should feel free to dump your used motor oil in the street, but you also arent adding a lifetime worth of consumption to the pile. Further, even if you lived in a cave the rest of your life, someone is one broken condom away from invalidating your (lack of) contribution.
Further, the argument could be made that what we’re doing to our environment is the “natural” way of things. Stick a bacteria culture in a petri dish and what does it do? It expands to the limits of its environment and consumes all available resources until there is nothing left it can use. Earth is our petri dish, and we’re just going through the motions.
If a person doesnt exist, they don’t consume anything. No food, no air travel, no electricity needs, etc…I’m not saying that anyone who has, or wants to have, a child is some kind of asshole, its our biological prerogative after all. Just saying that when comparing individuals and their contribution to climate change, those who sired children are subsequently responsible for a lifetime, or possibly several lifetimes, of carbon emissions.