Is it possible to feel your something when your nationality is different?

I am an American, born and raised, more specifically from Texas. My family has lived over here, some for about two hundred years, others just a little over a hundred years. We're Southerners, but I just realized that no one is American by blood: except for the American Indians. By blood, I'm Irish, English, and Scottish. I'm more English than anything else I think, except maybe Scottish. I don't have any family that I know of over there, and yet I guess I'm British by ethnicity. Am I right? And why did I feel somewhat 'at home' over in England when I was over there four years ago, like a core part of me belonged there? My mom did, too, and we're both as native Texan as they come. Is this natural? I love the U.S. and I love Texas, with all of my heart, but what is wrong with me?