Honestly I don't think companies expect you to really know anything about specific technologies if you've just come out of school. Most likely they just expect you to have strong fundamentals in CS, which hopefully you learned, though you say you "feel like [you] didn't learn much at school".

My only advice is to keep applying and work on something while you are still unemployed. You left out whether you've been getting interviews or not, which might be important to see whether it's your resume or interviewing that is the problem.