I'm depressed I have fucked it all up.

I'm in my last year (3rd year) and I thought wow it's gonna end now only for me to make the biggest mistake ever. We are required to bring admit cards to exam centres and my ass forgot it at home (now my home is an hour away). Exam had already started and I was running late ontop of that I discovered I had the Admit card of my friend who asked me to print it like 2 weeks ago and I did. She was obv giving the same exam as me but she had her own copy as well. I had no idea, I panicked as I was literally running very late for the exam. So, I just pasted my picture on my friends admit card....and got it stamped by a teacher and went on to give exam. Yes ofc the teacher busted me(they never check and they did finally). I tried explaining that I'm not giving this exam in place of somebody else and I'm not impersonating anybody. But they put an UFM on me and now I gotta repeat the whole year. I have never indulged in any sort of misconducts or its not like I don't study.....I'm depressed I can't eat. I thought I would do MBA after this, no one would ever accept me. I regret this so much, wish I would have just checked my bag once before leaving..... It's not about yes face the consequences now, it's about how I wish I could turn back time, I can't really take repeating the whole year alone.