Women Who Try Too Hard: Breaking the Pleaser Habits | 
pickMy therapist loaned me this book to help me learn about my people-pleasing, self-depricating tendencies and where they've come from. That's important to understand because for me, they've let to anxiety and depression. This book takes a great look at that - geared more towards married/dating women, but insightful even if single because of how it delves into childhood relationships with parents, and different categories of adult pleasers.