This is complicated. I’m concerned you may have confused several important but different issues.
First: Your temper: You said that you grew up with a bad-tempered father. Since he was not able to control his own temper, it is likely that he could not teach you constructive ways to deal with anger and disappointment. You have copied his methods. Those methods don’t solve problems. In fact, they make problems with other people.
Second: You were being bullied by the people who circled you. Anyone would be frightened in that situation. You should not have to deal with being picked on and picked last. Rampaging got the group to back off but did not solve the problem. You need to talk with your aunt and grandfather about the problems in school. I hope they will talk with the school administration about protecting you from the bullies.
Third: I don’t think you are weird. I do think you have an artist’s eye. That is not something to be ashamed of. Your obsession with drawings and how things look is common among artists and photographers. I hope you will explore ways to express your creative spirit.
I wish you well.