You can write some really authoritative books on your ultra - secret, classified exploits, too!
Like shooting up some major terrorist!
Nah, There's plenty of books for that.
8 years or so ago, I was trying to help my future sister in law(at that time) with some relationship difficulty from a mans perspective. My lovely SIL has a problem with anxiety and always seems to carry everyones burdens upon herself and can't separate her struggles with the struggles of the man she was currently dating at the time. The topic of Differentiation / Differentiate was just something she couldn't grasp.
'Samantha! His problems and his struggles with whatever they are are not yours to carry and to struggle with. Sure, you can help him thru it, or develop a plan of attack to overcome them together and be his accountability parter in that way...But, ultimately, you HAVE to say: "Fuck you, Thank you, Goodbye" to carrying other's issues upon yourself, otherwise you will be miserable.
If I were to write a book, it'd be for tender Millennials overcoming anxiety and normal life difficulties titled: "Fuck you. Thank you, Goodbye."
Now, fuck you. Thank you, Goodbye

*insert sarcasm above*