To be authentic means first to be fiercely self-aware, which means you NEVER lie to yourself. It means you develop genuine relationships such that both people are better off. It means you’re mindful and present.
You’ll be less stressed as there will be fewer (or no) discrepancies between what you actually are and what you think you need to be to gain respect from people (some of whom don’t matter). You’ll spend more time with people who encourage you to be you.
It means wherever you go, you’ll be celebrated, not just tolerated. That includes alone time.