so i journal all the damn time, and i enjoy it. it keeps us sane

lets me remember where i came from. A friend a few weeks ago said i should take my journaling and do a full blown book with it... i've wanted to in the past, i even started the first chapter of one in the past, then i had this writing college class and the instructor was one of my co-worker's dad. Turns out he knew i worked with his son, and he hated how his son had taken to the computer industry instead of doing something with his life and being a reporter like the old man right? So his dad took out his frustration on his son on me because i was just like his son, working in the same career path, we were good friends and very alike. I kept writing papers and re writing, and sometimes made up to 15 drafts before i was done! jack was very impressed with himself but slowly and surely we failed the class, we were the best student in there, contributed the most to the group, all of that... and we failed. since then i just haven't felt like writing until my friend recently brought it up and i've just been mulling it over.
do i let some teacher shatter my hopes of being a good writer just out of his own hatred for his son and taking it out on me?
maybe i looked too far into it, maybe im just a terrible writer and he was very dry in how he told it?
do i make a book and then someday it turns into a flop, i realize half way through its just the insane ramblings of myselves?
im thinking of giving it a shot, the whole idea of "###$ what everyone else thinks", a mentality i have adopted and adapted from bates