Haha, many people confuse increased age with increased maturity and ability to take on responsbility. Everyone grows and matures at a different rate, so there are many 14 year olds that may be more mature than someone in their 20's. Just a little tangent and off topic, but hey, who's paying attention?
Once again, I can sympathize lol. I hadn't swam in about a year and when practice started for the swim team I was quite out of shape. I do run, but the difference between the two is immense (and includes getting mannnnnnyyyy cramps while trying to switch over). But ya, I would just make sure to check each hospitals policy. I know I have about 3+ hospitals in my area (I'm only looking into two of them though), and their policies are all different. Methodist allows daily volunteering while OSF only allows for summer volunteer services. Both, however, require the filling out of an application(one was online, other one was mailed). So ya, I would just say have fun with soccer. The only thing you can really use extra experience for would be to be ready to volunteer more in college. Most universities do not require much to get in (high school teachers exagerrate the difficulty of getting in). I would recommend doing a little bit during the summer (40 hours min is usually the requirement, which really isn't that much time) just to get the hang of it, and to get aquianted with the hospital. They will also be more likely to give you better jobs the longer you have been there and the more dedicated you seem. Good luck with soccer! I know it's a heck of a lot of running, but it's definatly worth it. Why is your season starting so late? Unless you are a female, in which the timing would be just right, the season has been over for a while where I am located.