The book also exposes her painful relationship with her mother, therapist Linda Carroll, Newsweek reports.
"When I get around (Carroll), I feel so awkward and timid and weak ... trying to prove to her that I can make friends and be popular," a 12-year-old Love writes.
Later letters come from inside an Oregon prison.
Love's diary book hits the shelves a week after her late husband, singer-songwriter-guitarist Kurt Cobain displaced Elvis at No. 1 on Forbes's list of the top-earning dead celebrities, Newsweek notes.
Part of that comes from Love, who sold her 25 percent share in the Seattle-based rock band Nirvana catalog, and earned Cobain's estate $50 million.
Celebrity Families of 2014 [PHOTOS]