I'm trying to save my parents grief not save myself from getting into trouble... bcuz i hate seeing them all freaked out and its stressful for them and thats the least they need
This statement say's volumes about you (Which is a good thing). You are showing empathy for your parents feelings, and I think that is a good thing.
If your motivations were leaning more towards avoiding punishment then I think I would have not responded. In light of your current disposition, allow me to offer my 2 cents.
If your above statement is truly how you feel, then I suspect your parents are very understanding people, and I also think that you can go to them with this problem without fear of punitive recourse or a emotional breakdown of your parents, rather a small discussion about how you might reflect on this lesson.
I guess what I am saying, be honest and truthful as this is a better way to live, and in the long run you may learn something about your parents and life. Furthermore, they may be able to help you and relieve this undue stress.
Trust me, as you go through life, you will discover that this is small potatoes in the big scheme of things...