But all is not lost. It's hard to find a startup job where you won't be working closely with people from cultures where discussing your salary, rent etc. is perfectly normal.
That's how I was able to discover that as a woman I was making 75% of what my male colleagues were making. That's a Pandora's box type discovery, and I did stew on it for a while.
But I liked the company, and I didn't want to leave, so I saved that information for the end-of-year talks. They ended up bringing my salary level with the others', and then I was asked politely not to do that again.
It was quite uncomfortable for my boss - despite what you may think, your boss probably doesn't remember your exact salary - and I think my salary was an oversight (I was one of the earlier employees) rather than an intentional slight or because I'm a woman.
But still - what are the chances that could have happened if I hadn't asked my colleagues?
Don't ask, don't get.
I understand that you may be rationalizing it, but I find that hard to believe. I may not have remembered my direct reports' exact salaries, but I certainly knew who made more than who, by approximately what percentage, and why each person was paid what they were.