It's simple. If you don't want people on QL to know who you are or know anything about your personal life then don't give out any personal details.

Personally I don't mind if people know who I am in real life, and I make no attempt to hide it. Everything I say on QL I'd say in person. But that's my choice. If I wanted to remain anonymous, it wouldn't be hard.

If people find things out about you then there's only yourself to blame.