Many people ask for permission to do things because they secretly want to be told no.
If you don’t want to do something, just don’t do it. It’s unlikely that you’ll be called out for cowering in the shadows and sitting on an important idea. No on can read your mind, and you’re not responsible for what nobody knows.
But if the terror in your belly confirms that you’ve got to give it a shot, then hurry up and jump. If the anxiety you feel is because you actually might have what it takes to execute, then go for it.