Kid harassing me led to fight

I’m 15, and there’s this kid who has been harassing me every day since the start of the school year, being verbally abusive, pushing me, and just generally messing with me. He’s already gotten in trouble with the principal before because of how he treats me. Whenever he sees me in the hallway, he will specifically go out of his way to push me. Fast forward to today, he saw me and my friend in the hallway and started pushing both of us repeatedly. I ignored it at first, but he kept doing it, so I smacked him. He tried to fight back, so I put him in a chokehold. When he kept retaliating, I let go and went for his legs, slamming him onto the floor. I tried to kick him in the head, but I missed, and that’s when the fight stopped. I went to the office, and the assistant principal checked the cameras, but he said I was doing too much over a “little push” and that the kid was just trying to get through in a rude manner which is not true. His purpose was to harass me, not just get through,as everytime he sees me in the halls he will push and harass me. this kid harasses everyone in my class, even the teacher doesn’t like him because he’s so annoying. I feel like this isn’t right.