Here's my advice:
I think it's a mistake to worry about weight, given that at your height and weight you are far from being fat. The way to reach your potential as a runner is by training better.

As a teenager you've got enough to worry about regarding maintaining a positive self-image. Spending your energy worrying that you might weigh too much is negative. Spending your energy training hard and making yourself stronger and faster is positive.

A sixteen year old girl is not growing anymore. She has reached her full height.
In general, people will shy away from telling a teenager to lose weight, especially if she is within normal weight limits, since there are so many girls that develop eating disorders. Therefore, this board is not a good place to ask the question.
I would recommend that you go to a nutritionist and ask the question there. Many health plans cover nutitionist visits. A personal trainer probably would be a second choice, but be careful to go to one who deals with HS athletes. A running coach may not necessarily be a good choice, especially if their only focus is running, rather than overall health.
Finally, be aware that many adults who are within normal weight range do choose and want to lose a few pounds, for whatever reason, so your request is not abnormal or unusual. On this board, however, you will not find anyone telling you, yes, go ahead and lose them.
The first part of the last sentence in your OP is especially worrisome.

quote:<HR>Originally posted by Ice Cream:
A sixteen year old girl is not growing anymore.<HR>

Not correct. Maybe or maybe not growing taller (I grew an inch at 17 and one at 18). Many females do experience skeletal growth (and certainly skeletal development) into late teens (start of puberty plays a role). Moreover, teenagers are certainly developing in ways that 28 year olds are no longer developing.

A general Developmental psychology (or just developmental) text book describes growth processes and the general ages they take place. It is fairly agreed upon that poor nutrition during childhod, teens, and ealry 20s is even more dangerous than poor nutrition later in life.

Maybe, maybe not. It depends on a host of factors. What does your coach say? I think you have gotten good advice here, but it looks like what you really want is validation to go on a diet. As you can see from most of the people who have replied, no one feels comfortable carte blanche telling you to do that. You need to talk to a nutritionist and perhaps your doctor.

quote:<HR>Originally posted by Ice Cream:
A sixteen year old girl is not growing anymore. She has reached her full height.
The first part of the last sentence in your OP is especially worrisome.<HR>

ice cream, do you have a link to evidence that all 16 year old girls have stopped growing? that is blatantly incorrect.