My evil autistic trait is that I cannot experience "missing" people. What does it feel like?

In all my 40 years of life, the double-edged sword of my autism is that I don't experience the urge to be with people when they're away from me. While others are miserable, sometimes beyond consoling, I can shrug it off like nothing. Neurotypicals call me "uncaring" or "aloof" when I appear not to miss people, or think of them when they're away from me when (often) it couldn't be further from the truth.

So my question to the autistics who *do* miss people, how would you describe it? Is it a pain in the chest? The brain?