Well since there are many billions of people, solutions should adapt to their presence, not to a sick ideal of eliminating several billion of them. The world is in the first place not even overpopulated, it just manages its resources badly in certain contexts, and secondly, no person alive today has any less right to life than you. Ergo, if you hate several billion extra humans, you should also hate your own presence by this logic.
I dislike being around people. More people means more competition for the good stuff like space, a nice view, quiet, delicious fish/game, etc.
You might argue that more people produce more other good stuff, but that is a flawed argument for a few reasons. For starters, a lot of scarcity in our economy is fake and introduced to maximize profit. Second, there's only so much valuable work to be done, but everyone has to have a job, so somewhere between 50-80% of people end up doing meaningless work (think of all the people involved in making/marketing a lot of infomercial garbage and lame tchotchkes like dog bowls shaped like toilets that flush when the dog eats). Nobody would miss those things if they'd never existed, and I'm sure none of the people responsible wanted to do that sort of thing growing up. It's basically a big capitalist circle jerk.
I am an introvert, I don't always like being around people. But I am glad that those people got a chance to exist and experience life, and am willing to accept inconvenience for that.
But if they didn't exist then it would not have mattered? We are just space dust, until we are born we have no conscience, those who not exist cannot miss anything.