Being hated

Has anyone else dealt with this? Seething hatred from other people being thrown at you for no reason? I've always been a shy introverted individual and I guess people could find me boring or whatever, but why the hate? It's not like I'm bothering anyone by keeping to myself. My parents bullied me about this throughout my childhood and they still do it today. Throughout my school years, I've always had at least one person who really hated me while the majority of people disliked me enough to speak badly of me when I wasn't around. Can people just sense weakness in others and want to attack them for it? I just don't get it.