In Writing Tidbit #1, I said that writing for realsies is not something to be done alone. You need to seek feedback on your work in order to help you improve. This means that, yes, others will be critiquing you and pointing out flaws. That can feel very intimidating, raw, and painful when the subject of criticism is something as personal as a story you've written.
I know no better way to respond to this than to say, "Suck it up and do it anyway." While there are exceptions, most people knowledgeable in writing have no interest in hurting the feelings of beginner writers. They like to see others succeed, and they know the value of critiques when looking for ways to improve. So take their comments for what they are: advice to help you get better.
Though it may be hard, try to not be overwhelmed or angry when someone doesn't exactly love your plot or characters. Instead, listen for hints on how to be better and create a story they will love. Do not think of an editor's red marks as an attack on your talent and love of writing, because they're far from it.
Similarly, don't put too much value into a friend or family member's gushing praise of your writing. We can all use a pat on the back, and it's nice of them to review your work. Their opinion that you're the best writer since (insert famous writer's name) may be accurate, but do get some outside, expert opinions before approaching publishers with your listless, grammatically incorrect project. Such a gesture will only make them leery of your work in the future.