You weren't sure if it had always been like this. Desperate for attention from your father, trying to earn his approval. You were smart, sure, just not as smart as he wanted. However, you knew that he had always been secretive. Hiding things from you, insisting that they were too complicated for you to understand.
This led to you being home alone, again. He trusted you enough to not destroy the house, though you weren't sure how much of a comfort that was. He should've expected you to figure out what was happening behind the scenes eventually, but for some reason, he didn't. Maybe that was part of the plan. You weren't sure anymore.
He gave you options and looked down on you like he usually did; leave or prove yourself. Maybe he planned for this, or maybe you knew that he would not let you run with his secrets. You eventually chose to take part in his cruel experiments, scared of the consequences but still desperate for his approval.