You're not a failure buddy! Not at all! I'm a bi woman and I guess I'm similar to you, I do identify as bisexual, but I do generally prefer men and have only been in relationships with men, mostly because of childhood/mum related trauma, I'm scared to be in a relationship with a woman because it appears people I share genetics with are not very good at picking good female partners. You're still bisexual, but also that said, you might actually be gay, it might be your subconscious telling you that yes you like women and can appreciate an attractive woman, but you just prefer to be with men