The Bible tells us to let our light shine, so that others will be drawn towards God through our everyday actions. Even if you don't have a chance to talk to a certain person often, you can still be a light to them. Actions speak louder than words...MUCH louder sometimes. Just because someone is quiet, or doesn't seem the most friendly, they are still watching and observing to see how you act. Just by living for God, and making wise decisions, or just being a difference, the one that stands out, is being a light! It is hard sometimes, especially when you're the only one. But stand strong, and ask Jesus to help you be who HE wants you to be. You never know, you could be the only light in someone's path, the only person that they will ever have in their life to be a difference.
So, let that light shine! :)