Smile. Smile even if life isn’t good, smile because life can be good. Smile because of the possibilities and everything that’s going to be.
Find a way to destroy whatever (not whoever) destroys you. No matter how long it takes. No matter how hard it is. Make it go away.
Get yourself a passion. Something (not someone), a hobby you can live for.
Love yourself. I know it’s hard, but you have to find a way, or you will never know how good life can be.
Stop thinking. What others think is not relevant, if it makes you unhappy. Enjoy. Concentrate on what you’re doing. Decide by feeling: If you feel like something’s the right thing to do, just do it.