It's way to soon not to be terrified. It will get better, but real life nursing is a lot different from nursing school, and it can take quite a while (months to a year to begin to feel comfortable.) Hang in there.
You are really being thrown in at the deep end. No new nurse in our PICU would have a patient with all those lines and drips without much better backup. Who is the person in charge of your orientation? I think you should speak to this person about...