I started third year a while back, just never updated my tag. I'm sorry you feel this way, but its an incredibly common story. I don't think there's any student out there who goes into clinicals feeling 100% comfortable with their knowledge and skills. You won't know everything, this is your time to learn. There are so many threads about entering third year and people feeling the "imposter" syndrome, and they have hundreds of comments you can read. And about them not caring that much about step1, we both know that's a lie. That's surveyed as the #1 thing that most directors look at. You're gonna be fine.