Paying $2500/mo for rent alone on a $50k salary is crazy.
I know plenty of grown adults that have roomates, because they prefer the quality of accommodations they can afford that way to what they would be able to afford without them. (And not even in places with Bay Area-level high cost of housing.)
If it is unacceptable to you, that's fine, but don't pretend it has something to do with being "a grown adult".
It's a real stretch to say 50k is a livable salary in most of the bay area.
A reasonable approximation is to target no more than 25% of your take home for housing, but you can probably survive closer to 50% for a while if you must. So for 50k, you're looking at something like $800 - $1600 being manageable. You'd be much better off near the other end of the range.