Hi anon09 -
Hearing 'people' discuss you is not uncommon; it is usually (barring any psychological issues) you hearing the 'other side', or hearing on an astral level.
It can be amusing to some; other can be distressed by it - depending on the circumstances and beings. Just like 'mean' people and 'nice' people here on Earth, so you have the same on astral and/or the other side.
One method I recommend is shielding (with white light) to keep 'negatives' at bay - and there are numerous methods out there (you can try mine - free podcast - shielding
) and can do this as often as you feel is needed.
You can also call on your guides, the Powers-That-Be to protect you.