An important realization to have is that all of the fun events in your life, all of the dinner parties and hikes and trivia nights, all of them had to be planned by somebody. And at some point, you need to start planning your own events. Yes, planning events sucks. You need to corral people, sync up schedules, negotiate different likes/dislikes. But you gotta do it if you want to see people. I have friends who don't plan events and don't actively reach out. Frankly I'm a lot less close with them because to see them, I have to actively reach out and remember to invite them.

Learning to meet new people is a great skill too because it means you're not stuck with friends who you don't like. I used to be friends with people who I didn't particularly like. But I was afraid to lose them because I didn't have a lot of friends. When you learn to make friends, you realize that it's not worth keeping people around whose presence you don't enjoy. You can cut them off and make new friends.