Im feeling so guilty and I camt face it. How do I stop this?

I am 18 now and i gave some exams at school which i didn't pass so i can't get into university (greek system) i was anxious and the subjects were very difficult that everybody failed it was even on the news. The bad part is that i picked to go to college which i have to pay. If i had passed id go for free to a uni. I couldnt go for a second time. The tuition and fees are very expensive. Its 6100€. My dad is a very hard working man that everything he has achieved he has done it by himself. He had a tough life and we dont have a lot of money. Middle class family. He payed today 500€ the first dose. I felt so guilty that i can't stop crying. Id rather sit in the sun everyday and get this money by myself than my dad that works all day has diabetes one kidney and blood pressure pay for me and give his everything to me. I can't stop crying and feeling guilty. I can't stop blaming myself. (he's okay he takes his medication but it kills me inside) He told me that he will always try for me and i couldnt hold my tears. Its like something that i can't accept. I will study very hard to make him proud and ill work and save some money so after i finish ill spoil my parents with trips and gifts so bad because they deserve it. It still doesn't kill all that pain im feeling. He works 12 hours and more sometimes. I can't watch him pay for me. How do i stop this guilt. Ill work after 18 because now i can't but still it doesn't kill the guilt..

Im feeling so guilty and I camt face it. How do I stop this?
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