One very important lesson I've learned about rejection is that it allows me to review that particular manuscript with a keener editorial eye. It give me the opportunity to make it better. Because, come on, how many of us are perfect? The first time. And for writers, the second, third, fourth and tenth times. But eventually we get it right.
Even when our stories seem just right to us, editors may not see it that way. That's okay. They're entitled to their opinions. The next one may be more like you and love it as much as you do. The only way to know is to keep trying. Submit, submit, submit.
Through a fellow member of the Chattanooga Writers' Guild I just discovered a great website. It lists contests, many of them free to enter. Categories include poetry, non-fiction and fiction. Need a boost to your resume or a boost to your confidence? Winning one of these contests will do it. I encourage you to check it out. The name of the site is Cathy's Calls and Comps.