If I co-own land with 2 other people but they haven't been making the loan payment for years, would it still be divided equally between the 3 of us?

Title to the property that you are writing about is what it presently is with respect to the recorded deed at your county recorder's office where the property is located. Dividing up a parcel of land is difficult to do where most of the time a person seeking such needs to seek such relief with the planning commission in the county where the property is located.

If you have been making the loan payments on the property all yourself for years, you have an "equitable lien" on the property as to the other owners that they need to repay you for. I suggest that you consult further with a real estate attorney about your situation and getting repaid.