Please, pretty please, with cherries on top, 초콜릿 coated, somethered in whip cream, with a wafer sticking out please help me

Okay well i'm in a group with five 프렌즈 now two 프렌즈 Katelyn and Samarah were in the same class last year, and they became really close. Now me and samarah are in the same class this year, and im starting to see a different side of her. She is immature and constantly hangs around some 프렌즈 we have in yr 12 annoying them (we know them from doing an 연기 thing together) and she is kinda shallow and brags a fair bit. And she's ended up causing alot of fights this year, because she gets really upset if we make a joke, 또는 if we get up her cause she's done something wrong.
Anyway (I'm kinda dragging this out) she ended up taking my 프렌즈 drink bottle and ended up losing it, which got Kateln in trouble with her parents, and samarah told me to go find the drink bottle.
Anyway, after taking to my friend Katelyn i've actually she's been saying stuff to Katelyn like telling her not to invite me out somewhere with those two, and always pushing herself into our plans if its just the two of us. Anyway, i've actually found out something that hurt me, and last 년 i ended up coming up with a stupid song, where i turned everyone i knew gay. Everyone laughed and i asked if it offended anybody but samarah said no, but then my friend Katelyn has just told me that she ended up going off 글쓰기 a song about me saying that i was stupid and ritarded.
And to 상단, 맨 위로 it all off, my mum and I have been thinking of sending me to boarding school, but i don't want to leave my friend Katelyn, but nor do i want to be stuc in the same class as Samarah as i've now found out a different side to her. And now Katelyn is mad at her and they and Samarah had an internet fight and she ended up dragging me into it, saying that we were both sick of her. So what should i do? should i go to boarding school, 또는 try to solve it? I can't make new 프렌즈 either cause most of the people in my 년 don't like me?
Please help me?