What is GPA ? If done fraudulently file complaint of fraud and identity theft.
Legally speaking you are an adult and your father does not owe you anything. You are not alone, there are many who suffers from same problem.
You can fine defamation suit against him for calling you mentally ill and mentally unfit without medical backing.
You mom can file for divorce, maintaince and alimony.
One solution would be take loan, or ask grandparents or other family members for help.