Matilda,

This is a really tough predicament.  Reparation for the wrong you did should be made, but only your conscience can determine the best penance.

Perhaps if you receive any scholarships toward college, you should give them back, but be sure not to penalize your parents — you would have to absorb that extra debt.  Federal loans are assessed on parental income, and the formula between your share and theirs is fixed. Still, nonetheless, you should try to absorb the responsibility for as much of the expense as possible.  

Private loans could be considered as well.

So, my feeling is that while the cheating happened, you can't completely sort out your "readiness" from the "false readiness" that the cheating manufactured objectively, and not going to college altogether would be a heavy penance (that's if you really must go to college; some find other careers that don't require those degrees, and they avoid the debt altogether).  Another option would include only attending the college of your second or third choice or a lesser school.

Lastly, I would pray fervently that God show me what to do.  He is compassionate and wants to see you succeed, but He also wants your honesty.  You already know that, and that's why you wrote.  Keep close to the Lord and He'll help you sort this out.  But forgive yourself, and despite the potential penance going forward, don't let that sour your joy. Know that God's rejoices in a cheerful penitent.  

When we receive God's forgiveness, there really is nothing to bring us down.

Peace,

Bob Kirby