When we lived in tribes or extended families, we learned parenting by observation and others around us could correct parenting mistakes before they became fatal errors. We don't live that way anymore. It's a tough time to parent. Parenting today takes place in a complex, chaotic, crowded, competitive, consumeristic, confusing, rapidly changing world. I, too, am a product of my times so that my thinking has been influenced by the nurture assumption.
Wise parents try to live in the moment and do the best they can.
How your children will turn out is unknown. Love your kids because kids are lovable, not because you think they need it. Teach them what you can. Relax. . . . You can neither perfect them or ruin them.