If you are a writer, you have to learn to deal with rejection. It is just part of the landscape. Here are two posts about rejection that might ease the sting. The first is by Darcy Pattison, an author who I appreciate for her honesty and insight. And, this post from Writer's Digest's Wendy Burt-Thomas may help decipher what the rejection is trying to tell you. (It is NOT telling you to quit, by the way.)
This blog shares insights on the craft of writing children's books and the publishing industry, and supports creators on their journey.