Have you ever wrote about something and scared to publish

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Well I have this book that I wrote for about ten years. The book in question is an English/Otjiherero translator or rather dictionary. This is my first book I have ever written in my life. The book is edited by my good friend who is an expert in both languages and he complimented and encourages me to publish the work. I know the work will be valueable to the Otjiherero speaking people but I am just scared to go ahead with publishing. I don't know how I would handle the critism out there. riting is another way of expressing one thoughts but the toughest