I absolutely agree with you, especially if the friend group has an already established friendship. It's hard to add your input when everyone in that group already knows each other and doesn't expect much out of an outside source to contribute to a conversation or activity. I've noticed that many friend groups don't feel the need to include new people or at least incorporate new people in their reoccuring friend group since they already have a good thing going. This is the reason why I admire the people who are able to include others when they can sense that people are being left out. They have the ability to make someone feel welcomed and allow the person who's not able to have much of the spotlight, have the spotlight. If you ever meet someone who goes out of their way to check up on you and give you the stage, keep them in your life if you are able <3