"A positive attitude is the key to everything!" - endless rows of books on self-development assure us. "Reveal your potential to become rich and famous (after all, this is happiness)!" - urge the gurus of successful success on the Internet. "Probably, I'm just not trying hard enough, since I still don't live the life of my dreams," you think sadly, bumping into photos of invariably happy and successful acquaintances on social networks.