Yes, I do know what that feels like. I have a good relationship with one of my family members, but I feel like I'm a stranger to my siblings. They all go out and do stuff together, but I'm often left out. Granted, we do have different lives - they all have careers, families, etc and I don't. But I feel like no one even tries to connect with me or is "busy" when I try to. It's a lonely feeling.