Welcome Cheryl1977,
You are among friends and like minded folks here. Only about a year ago, I was at pretty much the same point of desperation as you seem to be now. I may not be quite in the same boat as you, mine is built somewhat differently, but a similar boat nonetheless. For me, I had not only wanted breasts, though that was a dominant urge for me (I really didn't know any of it was even possible), I had almost always had an insatiable desire to be a girl. Like you the urges ebbed and waned from time to time. It seems to me that it depended largely on how effectively I was pulling off my act of being a guy. Whenever my defenses were down, the female part of me would push her way out from her prison and make me feel the urges at full force. This always made me feel guilty, freakish, and drive me to push her back down deeper into her dungeon.
It was just over a year ago that things changed in my life and my strength crumbled setting her/ME out. The feelings had become overwhelming and I had no choice but to address these feelings and that brought me here. After spending a few days reading as much as I could, I came to understand, reflect on my true feelings, that I am transsexual.
I hope you are able to find the answers that you are seeking, whatever they may be. I will also repeat the strong advice that I was given nearly a year ago, seek out a gender therapist to help you to sort out who and 'what' you are. So, ask questions, read through the forums, make some friends and become part of the family. Nearly everyone here is very supportive and are here to help and be helped.
*hugs* and welcome,
Deanna