Just because you're a shut in doesn't mean you're depressed.
Most people are incredibly vapid. I don't like interacting with most people because of this reason.
Being a shut in is not as depressing as it seems. Perhaps you are an extrovert and simply cannot comprehend this.
That is really what a lot of introverts feel. It's okay if you are uncomfortable with that. We can recognize our own so in case it was not obvious that it was a blanket statement, let me just say "it was a blanket statement".