You are worth it. You're never alone. Even though you may think your life sucks, that's not true. God has plans for a good life. You just have to stick out the bad times. Live out HIS plan and be an inspiration to those around you.
Motivation wall — Put post-its on a wall in your room and share motivation with your roommate or write fun stuff for guests to read when they visit. Have a stack of post-its handy for people to write their own.