ust my opinion (which is worth nothing, really), but I think the mistake people make is reflected by your use of the word "beloved." If you let yourself get too invested in your story, then any amount of negative feedback will hurt.
Are any of your works not beloved? I am emotionally vested in each and every story I write. I cry when I write sad parts or even reread them when editing. I get horny with the sexy parts. I am entangled with every one of my MC. Intellectually, I understand being able to step back, but I could never do it.
I guess my best analogy for pushing submit and waiting for responses -- and I admit to being one of the ones who constantly refreshes -- is like watching my son when he would come up to the plate in a little league game. I wanted him to be able to feel the exhilaration of getting a hit and feared for the sorrow of a strikeout.