a small frog in a big pond

Someone or something within a larger operation or organization who is of less importance or less qualified than those around him, her, or it. This thankless IT support job is really getting old. Ever since I started here, I've just been a small frog in a big pond. Though Jennifer was popular and well-known within the walls of her small high school, she became a small frog in a big pond once she started attending a large state university. They don't care about us interns at all. We're just small frogs in a big pond, doing all the printing and copying without any recognition whatsoever.