That your parents never married is not an issue. That they are not married now means that FAFSA can be filed just using your mom and if she's married, her spouse's information. Talk to your school counselor about getting a non custodial waiver, but also be aware that it can be turned down since you have had contact, even support from him until recently, and look for some schools that do not require non custodial parent info in your list. Vanderbilt and Denison are some examples. Also make sure you have some financial safety school that you know will accept you as well.