Answer:
Douglass will tell his story using the first person point of view.
Step-by-step explanation:
It's clearly stated that this passage is about after the things he did/went through in the past, it means he said it event by event, in chronological order.
Next thing, the paragraph seems as if every events are already revealed.
He is telling his story saying 'I', which means he's telling the story from first person's view.
He is cleary talking about his life events and all in story format, not using in dialogue or developing certain characters.