Hi. I'm getting married to a US citizen. I was here in the US on a B-2 visitor visa 10 years back. I was young when my parents sent me. I stayed with an uncle and attened school. I've been out of status since 6 months after I first entered. I've been to college and recently graduated. Now that i'm planning on getting marreid, my boyfriend and I have done some research as the what the filing process is for me to get my status changed. We are fairly sure about what forms to fill and out. However, the once concern that I have is the following: When I applied to college 4 yrs back, my uncle filled out my application and had falsely checked the box that says I'm a permanent resident just so i would only have to pay in-state tuition - otherwise i couldn't afford to go to college. Now that i'm going through this application process, I'm sort of afraid about that false information that was provided. Do you think this is something that can be used against me to deny my application? Other than this, there has never been a time where i or my uncle have lied. - please help. Thanks

Generally speaking, only false information used for immigration purposes could affect your application for residency.
I would recommend consulting with an immigration attorney for further advice on the specifics of your case.