I feel I’ve gotten a pretty good handle on the idea of ‘happiness’ but I’ll let you be the judge of that. As so often my life is judged.
To start with anything you first must not have it. You do this by having awful parents, bonus if they were never there at all. Make sure your childhood sucks, memories to look back on and say “yep, definitely better than that.”
Second, without a parental figur...