I feel alone and isolated how can I change my life?

I'm 28 and graduated late. Fortunately I have a paid internship through the end of the year in software engineering. The whole 8 years I was suffering through college, very apathetic, despite having a high intelligence. I always thought getting a job was my main point of stress, but now that I've succeeded in that, I'm still depressed. More apathetic of a depressed state. I just feel like I don't know anyone anymore and spend all my time pretty much in my room alone because I don't have anything to do. It's now affecting me more psychologically, and I'm struggling to get anything done with work at all. Please help.

I feel alone and isolated how can I change my life?
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