You answered your own question: the answer is to discover a spirituality. The opposite of loneliness is to have connection with people; human beings by nature want to be part of something that's bigger than themselves, and there are different paths toward this. When you discover the nature of the soul and learn that this is the same for everyone, you get closer to others. You develop an authentic compassion for people, start focusing on helping others, and you'll learn to live in the moment and find joy in little things. That's what leads to happiness, not an embrace of lust or putting your individuality at the centre of your experience.