You can be straight and just enjoy watching that type of stuff, it doesn't necessarily make you gay. Porn aside, are you actually attracted to men? You even said yourself that you can't imagine being with a man.
I doubt you're truly socially inept or emotionally retarded, you're just young. You shouldn't try to write it off as something like that but try to change it instead.
-And sort of repeating what bb said- You don't need to label your sexuality. You shouldn't define how you interact with the world based on a label. Just be yourself and do what feels right. Be patient.