I'm very extroverted. I have no trouble making new friends that are interested in a hobby or like to meet up at a certain place. In the 24 years since I graduated high school haven't met a new friend who just wants to meet up, hang out, and do whatever because life is more fun with friends. Back in my school days I was pretty bad at making new friends but the friends I did make were legit. I still keep in touch with them and we don't need a plan to have fun.
If anyone has any insights or tips on how to make solid friends as an adult I'd love to hear it.