If you feel like you’re about to shit your pants, you’re on the right track.
Writing is terrifying in and of itself, but it’s even more terrifying when you decide to expose yourself and share your work with other people. It’s okay to be scared. It’s okay to be doubting yourself.
As Steven Pressfield said in The War of Art: “What finally convinced me to go ahead was simply that I was so unhappy not going ahead.” I know how you’re feeling, I’ve been in your shoes, and I can honestly tell you that every second of uncertainty is worth it, because the feeling you get from sharing your thoughts with the world and doing exactly what is it that you’ve always dreamed of doing is one of the most incredible and uplifting feelings in the world.
Even if you’re not absolutely certain about your piece, send it in. No one is ever 100% certain about their work when they decide to lay it out for the world. This is just the first step in many more steps that will get you where you need to go.