My situation is similar. My adopted parents were nice people, but nothing like me. I felt I little alienated growing up, and I attribute at least some of it to this. Of course, there are plenty of biological children that feel that way, too. My brother, who was my adopted mother's biological child, no doubt had a harder time then me because of a learning disability. And I recall a friend who grew up sensitive, artistic, and gay, much to the horror of his macho race-car-driving biological father.