9:30 as a freshman (which is what you are) is excellent and good progress. I have a 12/30 birthday and so I am about 1 year older than you at that point in sophomore year. I ran 9:50 and I believed that I could probably break :30 for 10k and 2:20 for the marathon.
If you hit 9:30-35 at age 15 you will be at the top of the age-lists (if they have such a thing) for America. Don't worry about much else.
All these posts about how you should be shooting for 9:18 and 4:20 are stupid as you can't dictate how fast you are going to be. Additionally there are a lot of great Americans who didn't run 9:20 when they were 15 years old. There are a lot of great runners who DID run 4:20/9:20 as freshmen or sophs and didn't get too much faster or didn't last very long.
I look at it this way:
This fast / at this age
10:00 / 15
9:30 / 16
9:15 / 17
9:00 / 18
8:50 / 19
8:40 / 20
8:35 / 21
... etc.
is far better than 9:20 at 16 and 9:00 at 17 and then quitting the sport or gettign frustrated that you aren't running 7:35 3k's like the African "juniors" supposedly are.
Running isn't a linear exercise in number like some seem to suggest up above. You cannot will yourself to run an 8:45 3k just because that seems to be where you should be in order to run the World Champs 5k before age 19 like some of the African seem to do.
Bottom line: you have some talent, it might be enough to run sub-14:00/sub-29:00 someday, it might be more, it might be less. Might be considerably less. The fun is in the working for it.