It's like why I wake up early. Then you can justify to yourself why you are feelings so lonely. Obviously, since no one else is up, it makes sense you feel lonely, but when you are around people and you still feel lonely, that's when you feel most alone, because it doesn't make sense.
If I'm cold, I can justify to myself the reason I feel that way. I'm not wearing a jacket in the winter, clearly it makes sense that I'm cold. Then, if I feel cold inside even though I'm wearing a thick jacket, I feel even colder than before and can't understand why I feel so cold inside.