I've felt that way. Intellectually I understand trans men by analogy, but deep down, I can't. With me it's not the genitals, I don't have that kind of dysphoria. I don't hate my penis except when it gets in the way. For me it's testosterone. T has played such heck with my mind that I can't imagine why anyone would want it. It made me belligerent, angry, hurtful. It led me to do things I'm not proud of. I tell myself that all that was because my brain wasn't made for it, but I don't know if that's really true. To watch people I like and respect put that into their veins makes me fearful that it will turn them into the same kind of hidden, raging monsters that I know I secretly was, no matter how well I hid it. Guys being guys scares me. But that's my problem and, intellectually, I can understand that FtoMs might well feel about estrogen the way I feel about testosterone.