Not being able to study at all- please please help

Hi there! I'm in my final year of high school and despite being an average student, last year I focused hard on my academics, it's just that suddenly I have no motivation to sit and study. I try, it's not like i dont. But, it's like everytime I take too long or i dont understand, I breakdown and cry. It just makes me feel like giving up and going to an average uni. I also have my exams going on, but nothings working out at all. My parents don't know what to do, they've spent a lot of money on my tuitions and are trying their best to push me, but I just can't. And I just keep comparing myself to other people and how well they're doing, I really wanna stop. I want to get focused on just do and not think. But nothings working. Please please help me if you can.