I feel left out because all of my friends are married, in love, or pregnant?

Don't feel pressured to follow what your friends do. Your 20s are for adventures, flings, enjoyment, not for getting married and having kids. Your friends are the ones that are going to miss out in the end. I'm 30 years old, all my friends were married with children right out of high school. Most of which, are now divorced. I had a blast traveling and being single. Even now, I still don't have children because I don't want them, I do have a love of my life to share it with. Have fun and go with it.