Chicks With Dicks

I'm a 50 year old married male. I've always considered myself "straight" however my interests over the past year has me questioning that. I've never been sexually attracted to men and never had any experiences with other guys, but lately I have become increasingly interested and attracted to shemales and transgender women.... Feminine, but has a cock basically. I've always enjoyed watching porn, (alone or with my wife) in moderation. This past year I've been watching "tranny" porn just about every day and masturbating every time alone, my wife has no idea. In fact I am more interested in masturbating to that than having sex with my wife. I'm not one for labels especially about sexual preferences, but am I gay or at least bi? I mean even when I watched heterosexual porn I didn't have the thoughts and fantasies I do now when watching trans porn. I've never fantasized about sucking a guys cock, but I do about trans cock. It's almost an obsession. I don't know if I should say anything to my wife, she is one of those types who believe people can psychotherapy their gay away. At the same time I fantasize about her coming home early from work and catching me giving head to a trans woman. Don't know what to do moving forward. I'm confused yet curious. The only certainty I have is that I'm going to end my confession and go jerk off watching trans porn.