When I was an angsty teenager I used to tell people that I hated everything and everyone, and would also be quite rude, sarcastic and vulgar at times. This coupled with my avoidant tendencies resulted in me not befriending anyone whatsoever for a very long time. I think the primary reason was that I just felt terribly misunderstood, unseen and unloved. Growing up, moving and finding more like-minded people helped that, although those feelings never quite go away entirely.