As Mark Twain said: "What others think of me is none of my business."
I know it hurts to think that someone has a negative view of you, but as stated, there are many reasons they might ignore you. A lot of people can only relate in negative terms and a cheerful, positive person is irritating to them.
You might be a horrible person, but all we know of you is what you post on here, so if you are you hide it well lol
Keep being you!