Getting set up

I have been really wondering/worrying about what I am setting my life up for. I spend most days now doing school for about half the day and then swimming, reading, or doing something with my siblings. What have I accomplished in life.
Strangely I feel that the greatest time in my life, when I felt most worth and fullness was when I played soccer. Particularly in Colorado. I had the best chance to share God's word with my teammates then I have ever had anytime else. I have many regrets for the way I did some things then. Sometimes I felt as if I had totally failed, that I was working against the kingdom of God.
But I always had something I was praying for or working towards, I could think on it and it was also a great lesson to me. As we moved to Arkansas I left that. Still sometimes I wonder what good it really did. If anything changed because of all that happened, or did I just build a hate for Christianity.
Recently I have wondered to myself what I am doing now. What purpose am I working toward. Think of Math... A great part of my life has been devoted to math. It is something that I find myself thinking about quite often even when I am not really working on it. What good is it?
My Mom and Dad don't remember the algebra they learned at my age because they have no need to. Who cares what X is? Not them. Math does help me develop my mind, it gives me something to think on, but will I need it later? Probably Not. But it is good to have that around to help me think and to fill my time. But I am starting to realize that it doesn't really matter. All the times I get stressed and worn out trying to finish a lesson are unnecessary because it simply doesn't matter. What should I fill my time with? What should I pursue? Or more accurately, What am I pursuing?
I have a dream to start a giant ministry in a sports complex. A sport will pull someone into a building nothing else. I haven't worked out all the details yet but I would like to have an all year VBS type of thing going. It would explain the Bible throughout the year in a chronological order.
There would be many different thing happening. That is my dream. I don't know how it could become possible, or exactly what i would do in it, but I have a few ideas forming and to me it's worth a good bunch of thought and prayer.
I'm not sure how I am working toward that, but I am trying to have a direction in life.