Theory of Me

"There she is, Jezebel, directly across the street leaning on her sky blue cruiser and pointing her face towards the clouds. The rain is coming down hard now, but she doesn't move. Her eyes flutter open and she smiles at me. It isn't shy or awkward like it had been before; it is warm and comforting. My heart rate noticeably picks up speed. I shake my head, turn around, and make my way slowly to the running car, not daring to look back."
This is the journal of a depressed adolescent. In this specific journal they are trying to understand their feelings for the strange new girl in town. Keep in mind this is only one of the journals from only one perspective, so you may have unanswered questions about the story line and for most of this journal their identity is unknown to the reader.
When there is a date and the chapter is titled as a journal that means you are reading a journal entry. Outside of that you are still in the perspective of this journal keeper they just aren't writing in their journal at that point in the story.