Switch to cognitive neuroscience then. Intros are like 3-4 sentences tops, or at least they were before I left the field. My partner does developmental psych and her intros are like 3 pages of the same shit. It's interesting how close the fields can be, yet have such different norms when it comes to journal etiquette. I can also attest to you that if you ever publish that thesis, you'll be reformatting the thing entirely to match what really goes into publications.
Soldier through, your advisors want you to succeed just as much as you do!