I said firsthand knowledge, as in the knowledge came from direct observation.
I’m sorry that you’ve decided this for yourself. I truly do hope that you will gain the insight to realize you can change your life for the better.
Even if I’m often not particularly nice to you, I do not hate you. You probably have faced a lot of social rejection in your life, which is not uncommon for people on this site. You may have gained the right to be jaded to some extent.
However, I think if you gained more confidence in yourself, your life could improve greatly. Your worth is not determined by how others have treated you in the past.
You are a person and are deserving of respect and kindness. If you are kind to others and they treat you terribly back, they are simply bad people. I understand that it is disheartening to try and fail over and over again, but if you are genuinely a good person you will eventually find other good people.
I understand that you are not at a point in your life where your feelings on these things can be shaken, so I do not think there is a point in reasoning with you. I cannot force you to change your views, nor do I think that would be moral. I wish you the best.