You need perspective: conditions in the West have continued to improve, in many ways, over the years and centuries.
You also need perspective about your role: you are one person in a group of billions. You look at the billions and their problems, and weigh them against your small contribution. That is incorrect. By acting lovingly, patiently, joyfully, and wisely, you may help many people, in 40 years of work. The world may go up or down during your lifetime; but, like "It's a Wonderful Life," your presence will help make life better.
Give a read to "When Invisible Children Sing," Chi Cheng Huang, M.D., "The Master of Lucid Dreams," Olga Kharitidi, M.D., and "Life before Life," Jim Tucker, M.D.
"The Masters and Their Retreats," Mark Prophet,
"Babies Remember Birth," David Chamberlain, Ph.D., "The Great Divorce," C. S. Lewis, "Psychoenergetic Science," Dr. William A. Tiller, http://www.tiller.org "Expecting Adam," Martha Beck, Ph.D., "Extraordinary Knowing," Elizabeth Mayer, Ph.D., and "The Reincarnation of Edgar Cayce?", Free and Wilcock, http://www.divinecosmos.com are also worthwhile.