Insecure girl

Hi I’m 12 nearly 13. I have been bullied in year 7 when this girl started shouting at me for no reason and I thought things would be better in year 8 but no, I got laughed at in maths, then people accused me of swearing and then harassed me all time. I’d hear girls laugh at me behind my back, this girl wouldn’t let me use the equipment in science and called me a name and this other girl pushed me off the bench and then pushed me again and said ‘sorry you were in the way so I decided to move you’ my head of year says I’m being too sensitive am I?