Naval Academy Requirements questions...?

I'm a freshman in high school and have a 90 average. Next year I will be taking all honors cles except math. I'm good at writing essays, and other work, but not great at math. I am going to start volunteering at the old age home near my area, and get a job next summer. I am on the school Golf Team, newspaper club, and Gaelic society. I am not being full of myself but I think I can be a great leader and have much ambition on attending the academy. I am also not the greatest swimmer. How do my odds of getting in look so far, are there improvements, and if so, how much will those effect my chances?