My "Best Friend"ditched me! IM SO MAD!?

ok so we just started 8th grade me and susan were the best of friends and we had problems and drama last year but lets not talk about tht ok our other friend mandy who trys to control our group of friends all the time and talks behind ppls back and stuff well susan is spending every secound with mandy and ignoring me like i even told her "u changed" and shes like i didnt change and i thought i was being crazy at frist but were going camping next week and she promised we could be in the same car so right in front of me today in cl she was talking to a teacher about the car and we just talked like last night on the phone about being in the same car but anyways mandy is like "hey susan u can ride in our car" and shes like "ok" right in front of me i felt like i was gunna cry i didnt wanna make a seen and i really dnt wanna be in mandys car cause mandy would just say "oh its full" and susan didnt even include me in this at all! im so pissed! and i just cant beleive she wuld ditch me like tht mandy wuld always be mean to susan last year and i was ALWAYS there for her and now tht shes like best friends with mandy this year she just ditchs me. i know she doesnt need space cause shes JUST hanging with mandy doing everything with her and ignoring me and i know one day mandys gunna turn on susan like she did last year! and we always use to walk down to the bus togather and today in cl susan asked mandy to walk down it just gets me so hurt like im being used she acts diff in front of me then mandy and i feel like i have no friends help!