I think having waves of dysphoria is pretty normal. I had a rough time as a teen, but as soon as I left home when I was 16 I was so busy with trying to work and survive that I sort of blocked out my problems. The dysphoria came back in waves at 19, 20, 22 and 23 until finally I decided to start seeing a therapist. My husband was actually in the know when I told him when I was 18, but we were so busy at the time that I didn't think about it. I kept telling myself I would wait until I had the money to do anything, and then I would get into therapy. I had times where I told myself that I was happy being female, or at the very least, I wasn't miserable. The truth is, I could have probably lived as female for years out of sheer tyranny of will. I wouldn't have been happy, but knowing my personality, I would have just kept myself too busy to think. I'm glad I didn't. I am much happier and healthier now. To be honest, I had doubts until I got my first shot. I laughed for nearly four hours and walked around smiling like an idiot for weeks.
That being said, I think how you feel and how you identify really is something only you can know. It is possible that you are gender fluid, it is also possible that you are ftm with dysphoria waves. I think saying that to be trans one has to experience a very certain amount of dysphoria or crippling anxiety is more harmful than helpful. There are many who have a terrible time dealing with their feelings and their identities, but there are also many people who transition later in life because they have a different level of dysphoria or different coping mechanisms. Would it be possible to see a different therapist and start from the beginning? Sometimes its best to start from a clean slate.