school is hard and i think people there dont like me (general thoughts about my school life)

i really cant tell. one time in science class during a mini whiteboard review game i kept getting answers right and a bunch of girls started giggling whenever i held up my whiteboard. in band today, i was sitting on the floor in the percussion section and reading a book and then 2 boys sitting in the trumpet section in front of me turned around and pointed and whispered to each other and i dont know if they were pointing and looking at me but it made me nervous. i remember in freshman year when this one group of girls would whisper about me and my girlfriend. sometimes they giggle when she asks to go to the restroom during class. 

im honestly just really scared of people i dont know. im scared of random people knowing anything about me or making assumptions based on little things they see me do or perceiving me at all. thats one of the reasons i want to go to a new school where nobody knows me or anything about me, but my parents wouldnt understand. i went to this school hoping for a clean slate only for the one person who made fun of me the most from 4th-6th grade to also be there. im honestly thinking about telling my parents to take me out of the school. its way too far away, costs a lot since its a private school, and i dont like anything about it other than my friends and marching band. i know this sounds shitty but my girlfriend also stresses me out really badly in school. im not trying to say that shes a burden for not being well, but ive been trying to help with her bad mental health on top of my bad mental health for over a year and its been kind of breaking me. almost every day, ill say something that makes her upset and she shuts down and stops talking to me or starts hitting her head on the table and i just feel like im powerless. my grades were awful in freshman year because i was doing really badly myself and my girlfriend's almost daily shutdowns were mentally exhausting both of us. im gonna try to tell her to get some therapy or something. if i cant find any way to help her, i dont know how long the relationship is gonna last if im not even good enough to make her happy. i hope that either she gets the help she needs and stays with me and everything is good for the rest of our lives, or she realizes im not the best fit for her and breaks up with me and finds someone who makes her truly happy. is that selfish? i really just want the best for both of us. im just gonna try to stay as positive as possible and be so happy around her that she just cant help but be happy too, even if im upset or feeling like im at a low point. but maybe i shouldnt keep hiding my feelings and issues from her. ive been scared to tell her things because she gets triggered when i talk about my own issues that she also deals with and threatens to do things to herself if i do, which doesnt help at all and just makes me hide things more. maybe i just need to get her accustomed to actually listening to me. i dont know. i gotta finish my homework im currently failing 2 of my classes