[ssgodderidge]

I agree. "I'd have close relationships (and not feel lonely) if I could simply, accurately explain myself."<-- seems sus.

Not all people who are lonely are misunderstood. Perhaps others understand the person, but don't agree with their actions/thoughts/etc, so they isolate themselves from the person. Being misunderstood could contribute to loneliness, but it isn't the sole cause someone would be lonely.