Yes. "survival of the fittest" comes from Charles Dickens, not Charles Darwin, but Dickens probably did not originate it. And yes, there were evolutionary theories around long before Darwin, including some that arose out of
fetura, or the breeding of animals and plants.
It may be of interest to the forum to read my paper, "Evolutionism v. Creationism" at
Evolutionism vs. Creationism The concepts are not well understood by advocates on either side.
But no, humans can and do breed themselves. We are the result of millions of years of social selection, which is still going on, with government playing a part in it, mainly by its influence on fitness functions. We can and have created ourselves to a large degree.
I have a new science fiction novel,
Wayward World, that explores how such genetic engineering might work out. See
https://www.amazon.com/dp/B01MPW3Y10 But the novel is about much more than that, including the use of
fetura, also known as evolutionary algorithms, to select public officials. It also examines how gestational accidents combined with self-organization, has a large effect on the traits one develops.
Fetura is a probabilistic strategy, not a determinate one. Its can improve the odds for fitness, but not the certainty of it.