When you talk about yourself, you almost certainly speak in the first person. And if you're telling a first person story, you'll use pronouns like "I" and "me."
If you're going to write your novel entirely in the first person, you'll present things as seen through your characters' eyes. You might write lines like "We walked down the spooky path, clutching each other's hands" or "I felt terrible about what I'd said to my sister." Those first-person pronouns are a great clue as to who's narrating a story.