Hey Matt,
thanks so much for your kind words of praise. It is great that you are marching in drum corps as it will help you develop the discipline to compose and put in the long hours associated with film composing. You will find that there are very few things in life that will push you as hard as marching corps and you can take that into the professional world and kick some serious ###.
Awesome that you have the desire to be a film composer. Study hard, listen to the classics (especially the 20th century) and develop your own sound. Don't try to sound like anyone else. Know that it is a long, hard road but if you persevere, you will succeed.
All best,
James Peterson