Even your friends who slipped right from college into seemed wedded bliss and cushy jobs are feeling the same pangs of uneasiness that you might be feeling. Surround yourself with people who make you feel safe and to whom you feel you can open up in a truly cathartic way. Personally, finding people I can share my struggles with has helped me immensely in my twenties; there's absolutely nothing more valuable than a friend to whom you can say, "Hey, my life is shitty right now," and hear back, "Me too. Let's talk about it."
It's also the right time to finally let go of your expectations of what adulthood should be. It doesn't matter if your parents married at 22 or if your friend is running a successful start-up; putting too much stress on preconceived ideas of what adulthood will be is a surefire way to tank all of your optimism and hopes. Life is too fucking short to daydream it away wishing you had someone else's.