It’s totally understandable to be confused when you’re 21. It feels everything tangled in your head, right? There are lots of doors in front of you but to choose and to enter one.. it’s hard to be sure of it. I think there isn’t any absolute answer on how to be good adult. You just need to experience more, meet people, go outside, talk more with people, try new things. Also, maybe try to have a discussion with someone about what confuses you. This helps to dismantle your strings of thoughts. If you need my help, you can also reach out to me.