(Not just for girls...)
No matter what may change throughout your life--no matter who leaves, who lets you down, who changes for the worse or better, no matter what unexpected things you find or lose--God is ever-constant and will never, ever change. He doesn't leave, change, go back on His word, or even sleep. He is always aware of what is taking place in your life, and He is in total control of it all-- total control. Never fear because He is on your side if you are His child. You are His little princess, and He loves you more than you could ever know. He never wishes any harm to come to His little girl. He is your daddy, and you can always come to Him and crawl up into His lap and let Him wrap His arms around you and love on you. When you follow God's plan, only the best will come to you. Sometimes, however, we may not understand the means that He uses to bring the best to us. You must simply trust Him with everything and then all things will work together for good. God loves you so much.
--from around March 2002, a time when I really needed to be reminded of this. But it's good to hear all the time.