Each person is different, some have a diary and others don't. A diary can be an excellent way to help you grow as a person, by looking back you can see how you handled or felt about different things and learn from it. I think its a good idea, although I don't have one myself.
Call it whatever you want if you feel the need to put pen to paper! I give this advice to anyone who is dealing with any kind of issue, for the simple fact that I believe it is an excellent venting system (especially if you have nobody to talk to) :) yes!! Guys can have diaries!! :) OO
Who cares what others think? It's your business, it's your thoughts ideas concepts, call it what you want. You probably pick your nose, fart & scratch your boys-who cares-keep it to yourself & you won't have to explain yourself to anyone- as far as normal-what does that mean
Many men--some of them very famous, even historically so, write diaries. A diary has many functions, including being a soundboard for your thoughts, and keeping a finger on your own pulse, so-to-speak. So, by all means, write and keep your own diary.