Says nothing about you. Says more about the people who don't want to hire you.

This is going to sound odd, but the world is what it is: Is there anything on your CV that might play on some negative stereotype? Stuff like an 'ethnic' name (whatever that means), minority scholarships mentioned, or any other items that rich white dudes might see as unwelcome?

Secondly, this is the trap of pure science careers - PhDs are almost a requirement. Ask economists or physicists. Obviously not the only way to go. Have you tried grinds? I'm sure there are a lot of kids struggling with basic math, science, chemistry, etc that would pay a few bucks an hour to get better.