Disappointing running times, will i not get any faster?

okay, so you friend knows nothing, you do get faster, a lot faster!!!!!!!!!. you have only trained for sports that don't require such long endurance as a 5k will require you to. you will need to train for a 5k specially. You have a lot of time to improve, in fact, you will improve until you are about 50 years old when you start decreasing your ability. you have a lot of time, try cross country or track, that will get you in shape for long distances. you are in ok shape, but not running shape, running is a lot of hard work and a lot of training, i started out just about 20:00 my freshman year and i thought i was in pretty good shape as i played baseball, basketball, and football the year before. The next year i ran a 17:12 and than i ran a 16:15 my junior year. you have a lot of time to improve, don't let your friend tell you that you won't, hard work goes a long way. over the course of one cross country season, a new runner such as your self, can drop 4 minutes and if you keep training, you can get fast, i mean fast!