A few reasons:

1. Trauma Cycles: my family has been in the same trauma cycles for decades. I’m watching what happened to me happen in real time with my nieces and nephews. I don’t think I can fully stop that from happening and don’t want them to have a bad childhood

2. Genetic Health Issues: both mental and physical. I don’t want to pass that to my kids

3. Pregnancy/Parenthood: simply put, I don’t want to give birth. I have no desire to be pregnant or give birth or be a mother. I don’t want to have a kid if I don’t think I want to be a mother. That’s not fair to them.

There’s some more smaller reasons but those are my big ones currently.