The New Kid's Mistake

So I got this new job as an assistant at the local library. It's my first real gig out of college, and I was so excited to work somewhere that values knowledge and books, you know, the classics like 'To Kill a Mockingbird' and '1984', not just the latest bestseller hype. My manager is this older lady, Helen, who used to be a librarian herself before getting promoted to management. She's strict but fair, which I kind of admire in her. On my first day, she gave me a short tour and introduced me to everyone on staff. Then, we got down to the nitty-gritty: how to file books, use the inventory system, answer patron questions, all that good stuff. She went over everything pretty thoroughly but said I'd be doing mostly menial tasks for now anyway. By my third day, I was feeling pretty comfortable and confident with my new job responsibilities. Then it happened. A woman came in looking for a specific edition of 'The Great Gatsby'. Helen wasn't around at the time to answer her question, so I jumped right in, ready to impress everyone with my knowledge. Problem is, while searching for this book, I mistakenly filed another copy of 'Gatsby' incorrectly in the wrong section, you know, like putting it where the science fiction books are instead of its proper place. Helen came back and immediately noticed what I'd done. She didn't yell or anything, but there was disappointment in her eyes when she looked at me. It felt awful, like this tiny mistake erased all my hard work up to that point. I apologized profusely, hoping she wouldn't think less of me. The rest of the day was pretty quiet for me; Helen assigned me some menial tasks and stayed away from training me further. I didn't mean to mess up like that. It was just a stupid mistake, but it felt like an eternity between when I made it and my next shift where I got another chance at proving myself. Now, every time I handle books for the patrons, I can almost feel Helen watching over me with this unspoken judgment in her eyes. I guess what I'm trying to say is that first jobs are a mix of learning new things and making mistakes, but sometimes those mistakes stick with you long after they happen.