Watching porn and fantasizing about sex with my older brother

I'm a 16 year old girl. I watch porn all the time, everyday. Would you believe it if I told you that when I'm fantasizing about sex with all these different porn actors and when I'm masturbating in my bed, I'm thinking about imagining what it would be like to have sex with my older brother? No...let me be more specific, I'm fantasizing about my older brother putting his penis in my vagina and having sex with me. I'm not masturbating when I'm fantasizing about him. All my porn masturbation fantasies involve him. All I'm wondering is, is this normal?