You choose your friends by being who you are. If you change, your friend circle changes. Your friends mirror how you like yourself, how you see yourself, how you value your time, what matters to you...
And you can also choose quite actively, say what you want to be around and what you dont want. And what company you seriously LOVE :)
Well, thats my experience. Being an introvert, I just dont have time and energy for any other than good company