You have misunderstood me greatly OP - as has the poster whose rude reply was promptly deleted by MN. You can read my reply to her, if not, I will re-type.
It is you who has implied that these doodles are not your best work - by being embarrassed to show the world. As I stated earlier, most creatives differentiate between their raw, and polished work. I have not said anything bad about your artistic ability but rather, because you said it was like a 'private diary' and from what I read, the main aim of Zentangle is relaxation. I presumed you were just drawing whatever, without meaning it to look polished.
Your calling my attitude 'shameful' implies that actually, your see these drawings as some of your best work. And are upset when people critique it. Why then, do you think they should be private?
A diary is obviously private, because you're presumably writing down your thoughts as a stream of consciousness, but also private things. These drawings are different. Of course if you were drawing explicit images then it would be somewhat, well not appropriate for the public eye.
You need to identify what it is you don't like. Is it fear of rejection with people critiquing your work, or your husband bragging about you, or you don't want to be known as 'artistic', or you feel additional pressure knowing that others have seen it... what is the problem here exactly?
Of course you don't have to explain all this to him, your no should mean no. It is your work after all. But you're getting very defensive of something you don't want other people to see and done for 'relaxation', so why should our opinion of your artistic prowess matter really?