A weak, spineless person. Someone who humbly awaits for pity attention to be given to him. Excessively grateful for anything given to him. Usually an incel type of personality. A people pleaser. Takes abuse with a smile and can never stand up for themselves. Let everyone walk over them and get treated like a door mat.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.