That said it is not a rediculous time I went 4:54 as an 8th grader, I had a winter of base training with Mead High School though. The guy that beat me in the city championships went 4:48 he won state as a soph a couple years later.
That said we were both 8th graders who had been training with the high school programs that we wouild feen into the next year. But we also were not the most talented guys ever, it is possible a 7th grader ran 4:45 but unlikely.
If you ran that fast good for you it is a great time for a 7th grader, keep training and get ready for a great track season