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Are you from SV? There are plenty of affordable places to live in SV. Just because everyone is talking about how SF is sooo expensive, does not mean you can't live in Berkeley/Oakland/East Palo Alto/other areas.
I'm from Santa Clara, and "affordable" is an extremely relative notion. Silicon Valley itself isn't much cheaper than San Francisco. Berkeley, Oakland and East Palo Alto are not in Silicon Valley. And frankly, they're not as cheap now as they were even 18 months ago. It's still possible to get a one-bedroom apartment for $1000 a month if you look around hard enough, but it's almost certainly going to be small and old…
There are plenty of places with decent rooms you can rent for $800-1000. I paid $825 for my old place in South San Francisco (20 min commute to SF). It was a 2300sqft house shared by 3 others.