If you are reading this and you are an academic, you know what it is like to be rejected at a journal. Depressed, shocked, angry, bitter, rueful, embarrassed. Whatever your career stage, these are all perfectly legitimate feelings. And they are common.
You'll find an essay here and here (pdf) which lays out my personal thoughts on rejection---and some strategies for coping. I don't have much practical advice, but I hope you find it helpful nonetheless.
Whatever you do, don't give up, don't think the field isn't for you, and don't quit. It's much earlier than you think.