feeling hopeless

so today i had my last ever lesson before my test tomorrow. i was driving along a dual carriageway and i made a silly mistake which i dont actually think was all my fault. so my instructror had told me to move into the right lane in my own time because we was coming up to a roundabout where id be turning right. i put my indicator on and she immediately panicked and grabbed the wheel saying not to move over yet as there was a car. i LITERALLY was not moving. i saw the car and was waiting for it to pass so i could move over. she then made me come off the roundabout and end the lesson and she deemed me a “dangerous driver” even tho yesterday after our lesson she was saying how good and safe i am and how im ready for my test 🤔 i honestly feel she was in an awful mood today and took it out on me. after we pulled over she said how dangerous i was (even tho i didnt move the car) and how shes NOT TAKING ME ON MY TEST?! so i now have no instructorr to take me on my test tomorrow and i feel so hopeless and she has totally knocked my confidence even tho i know i didnt do anything wrong 😖 she then drove me home (very awkwardly) and when i arrived home she wanted to talk to my PARENTS?? im 19 so this majorly confused me as im an adult and my own person, i felt like i was in school getting told off. so she spoke to my mum (i went inside at this point) and she told my mum how i did awful and shes not happy to take me on my test. my mum and her then had a bit of an argument as my instructorr has been telling us since october im ready. im so upset ive been waiting for this test for months and itll be so long and so much more money to get a new instructor and new test. and on top of that i PAID HER for the test thats supposed to be happening tomorrow. it was £170 for her to take me there and use her car:/ she also took £90 from me today for a lesson that i only went on for 45 minutes before she ended it. im also out of pocket £62 for the test i cant get refunded or change because its too late. so deflated and wanting to give up now. does anyone have any motivation for me to keep going😔its just so expensive. ive been paying £90 for 1.5 hours