Question: Since I am an upper classman but am not really involved in extracurricular activities at my school, but do volunteer a little outside in the community, will that have a large affect on my acceptence or rejection to college (such as Ivy League colleges)?
As far as ECs go, you need to show dedicated excellence to a few significant efforts, not a big menu of thinly spread involvements. If you're involved in some quality volunteer endeavors, that would be good. Quite frankly, though, you need to have more than "a little" involvement. The Ivies look for longer-term activity in a few "meaty" things, as I mentioned above.