[anigbrowl]

That's kind of pathological. I also don't care for ad-hoc social interactions, but you can learn a few routines to manage them, like wave but don't engage, or greet but say you had a long day and you'd prefer to talk later. It's probably not worth seeing a therapist over, but a little work on dealing with the small talk is much less stressful than the anxiety of skulking around hiding from eye contact. If you can't get past this then you should see a therapist, letting it stress you that much is unhealthy.