You should join a startup where generally everyone needs to carry their weight for the company to succeed which creates camaraderie opposite of loneliness.
They key point that's missing here is that ALL stock trades are on "margin" because in reality it takes 2 days to settle a trade, but that is abstracted away from you by the brokerage and clearing house, and made available to you instantly.
Caveat: I'm just starting to learn about all this, so it's probably not a perfectly accurate analogy.