How to maintain friendship?

Do not change yourself. I can assure you that you will be not happy with that situation.

Instead, you should search for friends like you. People that are quiet, too. People that do not need to go to a party every night. People thinking like you and with which you can meet on the same level.

Those people will understand you. They will also need some time to get familiar and so it will be okay for both of you. It makes no sense to get involved with extrovert people who will make things different to you. You would have to play a role to simulate being like them. That cannot go well over time.
2019-09-19 at 23:46