When you ask if you need further help based upon fantasizing about being a woman in a relationship, I hope by 'help' you don't mean curing (and I don't think you do). There's nothing wrong with this cross-gender fantasy, and it's probably one that many people have who would never consider transitioning to female (although it's probably familiar to many of us who have). If you're saying that such a fantasy introduces questions of identity and asking if you should seek help from a therapist who specializes in gender, then the answer is absolutely. Especially if you are experiencing any kinds of distress. Male, female, trans, non-binary--there can be nothing wrong with the you that you discover with the help of a good therapist. If you can't find a specialist where you live, any good therapist will listen and should research to help the best she or he can.
Best wishes