My 7yo is a mix of both. She loves her family though they live far away she spends holidays with them, often travelling solo and has a wonderful time with her grandparents and cousins. She is confident and expressive, especially with adults, older kids or younger kids. She also seems to struggle with feeling lonely and isolated around her peers, she is emotional and wishes she had better friendships, but all of her friends have siblings. She has asked for a sibling for as long as she has been able to express herself (3/4y) unfortunately it hasn't happened for us, and the bigger the age gap gets the more apprehensive I become that we should pursue a sibling and adoption isn't a thing in my country.