Why do all apartments seemingly force you to have housemates?

I'm new to CA and have been in LA for a little bit now. I'm looking to get my own place in the near future, but it's dreadful trying to find an apartment listing that is truthful. I'm zero percent interested in sharing a living space with strangers. I'm trying to find a 2b1+b with my significant other and if I search that in the criteria, even if I specify private, it often shows primarily available bedrooms and not whole units. I've never in my life struggled to find a private unit. It feels like such a scam. Is there a trick to finding a private unit to rent out?