take a deep breath, and dive.
that's all. honestly, you can't do much to stop fear, lack of confidence, or your anixiety, so just take it slow, and before you think of what others will say about your work, think about what YOU will say, after that, take a moment to imagine what YOU want them to say, and then after day-dreaming for a while, take a deep breath again, and remember.
the thing you fear can happen, and the thing you want can also happen, nevertheless, the things that WILL happen, are always things you won't expect.
maybe you will get a neutral comment from someone, seriously advising you, or a comment about someone disappointed in your work, but believing in you, or you may not even get a comment, you know? there are a lot of possibilities that can happen, so just take a deep breath, collect yourself, have a moment to dream and boost your confidence, then smile, and brace yourself for reality.
because in reality, it's different than fiction, and there is no absolute. in reality, you may get a good review, while sometimes, you may get worse. ones, but even if that were to happen, remember that, as long as you have little confidence, and you love what you have made, then surly you can stand whatever comes your way, be it good reviews, be it insult, or even the absence of readers, why ? because you already have the most important thing a person needs to live.
a passion for your own work, and desire to see it until the end, and as long as you have those two, then no matter what people say, you will always do your best. not for them, not for you, but for your work, so don't let your lack of confidence, and anxiety rob you work, from getting the chance it deserved. instead, just boost your ego for a while, then shut your mind from all the other though, and only look ahead, where your ideal result is, and start crawling toward it already.