Why don't we write, when we write?

Greatest fears/setbacks-
1. Somebody reading and laughing over what I wrote…
2. I might not use the right words…
3. Ok, the word is right...but not up-to-snuff, hep or cool :-(
4. Spellings…
5. Grammar…
6. Am I making a fool of myself?
7. Oops! I don’t think so that will SEEM to be right to the reader!
8. I am an excellent word chooser, grammarian, best at English but I am too SHY!
9. Will I be the most popular among the unpopular ones?
10. And here comes the tenth one (though I hate to number them): Oh No! They now know what I don't know!
Don’t fear to add your writing fears here. I hope all my friends who own a blog and don’t write just scribble here their inhibitions/fears/any hindrance to write … (Note: Writing is not limited to Blogging)