Hi Jennifer! You sound like me blogging. I dive in and hit publish so often w/out spending a lot of time re-reading. Sometimes you have to. Like you said- you're afraid you erase everything. Or you'll spend way to much time editing and it becomes a 10 hour post.
Just be careful when you do that, at some point you will get the grammar police on your tail. I do all the time.
My advice would be at some point to develop a routine. It will help keep you focused and in it for the long haul.
And automate! Check out some platforms like Hoot Suite
Hoot Suite makes it a little easier to publish a Tweet or a Facebook post, for example, and have it post to all our social network sites.
IFTTT (If that then this) Let's you create "recipes" to automatically trigger when you do "this". For example if you add a pin to a Pinterest board, it will publish a tweet about it. I like IFTTT because it can sometimes do a little bit more than the normal auto-publishing platforms can do.
Take advantage of the social networks auto-publishing. Most of them will work together and publish one to the other w/out having to use 3rd party programs. Automate as much as possible so you can focus on creating content and chatting like you do by following up on comments. And make sure your blog is set up so your readers can do some social sharing as well. Having pinable images, tweet and facebook share buttons really are worth it.