I’m so exhausted

So basically during my first year of university, the first assignment given was submitted late because of I didn’t know what the exact time of submission was and the assignment got capped to 40%. After that event, every single assignment I submitted got flagged for AI or had one issue or the other now I might not get into second year and I worked really hard to get into this school and to pass all my exams. I’m trying to suppress my emotions but how do explain to my parents that are paying thousands of pounds so I can go to school that I failed. On top of that, I haven’t been able to go to work, being idle for 2 months waiting for the decision has been slowly killing me emotionally. I thought venting it might help