My dad believes I’m going to hell

He's sending you an obscenely destructive message that there is no hope for you any more. On the contrary, for you, it's as simple as defining your values (honesty, fairness to others, kindness, etc.) and trying to act in accordance with them. That's it. If you tell a lie, work on trying to tell the truth next time. If you're doing a bad job at acting out your values, or it seems like you're stuck...remember Jesus is exactly where you are right now, not waiting down the road until you get things right. So do your best, be patient with yourself and don't beat yourself up, and know that discouragement is one of the biggest tricks of Satan. Unfortunately your dad is doing this kind of work for him, sorry to say.

BTW, the Catholic Church provides you with a great set of values!

/r/Catholicism Thread