So done with everything

I'm in my late teens currently in the middle of my final year (school) exams and going through a crisis rn.

Out of the five exams,i already messed up 2 and I've filled out forms for about a million entrance exams that I can't clear.

My mood swings are crazy.I feel over the moon in the morning to having a complete breakdown in just 2 hrs. I keep stressing so much that I can't focus on my studies.I'm filled to the brim with insecurities;I'm ugly, don't have any skills and academics which was my strong suit is slowly getting out of my hands.Recently had a huge breakdown,one so intense that I couldn't even maladaptive daydream (and I've been doing that since I could remember)The news,worry about my future career prospects,being a "loser" is constantly haunting me.I signed up for this two years ago full optimism and ambition and now I'm numb