Eh, I’ll give it a shot, being conservative, despite also being the OP myself:
*
You’re a liberal living in San Francisco (or Seattle, or NYC, or Boston, or Chicago…)
You grew up in a conservative Christian family, actually, but never felt the religion. On the contrary, it was rammed down your throat by your parents, who forced you to go to church whether you liked it or not, and gave scolding or dismissive replies any time you brought up tough questions like why God’s existence seem to have such weak evidence, or isn’t it excessively severe for people to burn in Hell for trillions and trillions of years, or why so many Christians live a hypocritical life. When you asked pastors or other Christians these same questions, you got no satisfactory responses either, only a stream of cliches and trite platitudes with no substance behind them. To top it off, these same Christians spread all kinds of fake-news and conspiracy theories on Facebook, along with chain emails, while at the same time making strident posts about evidence for Jesus’ resurrection - and also false prophets or others who make utterly unfounded prophecies or “declarations” in the name of faith.
You are deeply anxious about climate change and the heating of the planet, knowing it’s a ticking clock, yet conservatives dismiss it as a hoax. You consider it essential for a woman to have access to abortion (since the financial, emotional and social costs of an unwanted pregnancy are immense,) but Republicans want to ban the practice as much as they can. You know firsthand how bosses and companies can exploit workers, but Republicans oppose labor unionizing. You lived for a while in Canada and shake your head over how the U.S. healthcare system charges $40,000 for an appendectomy when Canadians get something much better. You are appalled at the Columbines, Sandy Hooks, Orlando, Virginia Techs, Las Vegas shootings, but the response of the 2nd-Amendment crowd is “more guns.” You see the U.S. defense budget of $700 billion a year - more than the rest of the world spends on their militaries *combined *- and keep thinking, “why can’t we take a big chunk of that and spent it on much more urgent needs like teacher pay, hospitals, the homeless, scholarships, etc. instead?”
All of this was bad enough for you before 2016. You were already a reliably blue voter; you voted Clinton, Gore, Kerry, and Obama. But now you watch as Donald Trump rises to the top of the Republican primaries. Is this a…joke?? At first Trump’s success is actually cause for liberal relief and some schadenfreude; he should be the weakest of all GOP candidates, makes him easiest for Hillary to defeat. But then Trump consistently remains within only 2-5% behind Hillary (why isn’t she beating him by 40%?!), and any relief is replaced by deep-seated worry. And then Election Night 2016 happens, and the worst fears are confirmed. Nor has it escaped your attention that the party that blasted Bill Clinton for his affairs in the 1990s has now elected Trump to the White House.
You aren’t exactly a fan of the Democratic Party - the big tent with all its infighting, constant mind-changing, factions going at each other - but they are much better in your opinion than the Republicans. You find that Bernie lines up most closely with your views, but since the DNC would never let Bernie win, you had to reluctantly go along with Hillary in 2016 and Biden this time around.