I can totally relate to the anxiety/pressure that come with writing. Some nights I'll sit down to write a post for Steemit only to get up an hour later with a blank page. Sometimes I psych myself out of writing because I think if I don't have the perfect post planned out nobody will like it or read it. Sometimes that's true. Sometimes those last minute, whimsical posts turn out to be something that people like.
Writing is definitely a gamble. Some posts/books may get more eyes than other posts/books, but I think that as long as you're actively practicing your craft, you're never wasting time.
That said - it's so awesome you published something today. :-) I'll have to check it out.