Did something wrong, don't know how or what to do.?

Well, I tried making copies of my report card, to change my grades so that when my dad see's them, he won't see the two F's I got. I ended up getting caught making copies in the library (but I asked the teacher and she said yes, but i guess she misinterpreted) and I got a detention. She noticed I changed my F in her class and she said she would be informing my parent.



So I went to a store, and made copies changing the F's to C's and gave my dad my report card. But mind you, I got a report card from my guidence counselor, but the ones she prints from her computer looks completely different from my normal report cards we get sent to the house.



I gave my dad the report card, and he noticed it looked different. He said he was going to call the school up to see about it. I'm sort of scared that he'll find out. And also, I have no idea when the teacher will call my Dad, so what do you think I should do? Please don't tell me to tell him the truth, because that's not an option. Lol.Did something wrong, don't know how or what to do.?
If telling the truth is not an option in your world...you deserve everything that happens to you...