At 21 Candy, I'm sure you've been away from home before, so I'm guessing that you phone/email/msn/write to your family members. Reach out to other people, be interested in them. If you are in another city or at uni, join a gym or a club where you will meet people. That way you won't focus on yourself and homesickness.

Keep your mind occupied with a work or school project. That way your mind won't wander and have thoughts of what you miss about home. In other words, stay busy!