Keeping Up with the Kardashians star Kendall Jenner, 28, revealed her struggles with loneliness and crying herself to sleep throughout her modeling career. During a conversation on a recent episode of Emma Chamberlain’s podcast, Anything Goes, Jenner candidly discussed the emotions she faced while constantly traveling for modeling assignments. She said her feelings of loneliness started creeping in as she jet-setted around the world for various modeling gigs. “It is very lonely,” the reality TV star told Chamberlain. “I’ve had really dark nights where I’ve been in random cities and just hyster…