im gay, have been open for a little over a year but sometimes feel like watching straight porn. is this normal?

So I've been openly gay since March of 2014 but I've known it for about 4 years before that. I watch gay porn but every-so-often, I watch a straight video. It doesn't even really get me going but I still feel the urge one in a while. Is it weird or normal to be gay but watch some straight porn on the down low some times?Note: I feel bad about myself after masturbating to straight porn because I feel like I'm cheating or something I don't know.