Thats the ticket right there, what does your property survey say. Regardless of how much lawn youve been cutting, or where your driveway is, if the survey sayst hat you don’t own it, you don’t. Many times houses are built before anything else is around, and they end up building accidently on neighbors property, but eventully some day that neighbor builds a house, and someone sees that a driveway or pool was built on thier property. And they are entirely in thier legal right to have it torn up, cause it the survey that determines who owns what. I would get with the town and look at your last survey, that will explain exactly whats yours, and where it is measured from.