The situation you described where your dad hit you across the back with a belt when you were 5 years old can be considered physical abuse. Physical abuse involves intentionally using force to cause bodily harm or injury to another person. Using a belt to hit a child can cause pain, injury, and emotional distress, which is not an acceptable or appropriate way to discipline a child.
Disciplining children should be done in a non-violent manner that focuses on teaching and guiding rather than causing harm. Physical punishment, such as hitting with a belt, is generally not considered an effective or healthy way to discipline children and can have negative long-term effects on their emotional well-being.
If you are still dealing with the emotional impact of this experience or any other forms of abuse, it is essential to seek support from a trusted adult, counselor, or therapist who can provide you with the help and guidance you need. Remember, you are not alone, and there are resources available to support individuals who have experienced abuse.