I could of written this exact email. I am a married Mom and I remember feelings similar to yours growing but more importantly I tend to have the "same" feelings pop up from time to time even now in my adult life.
I have found larger women more comforting as well. I have never been able to figure any of my feeling out since I had a normal childhood with a mom who was always there for me and still is. I have never acted out on my feelings and probably will never have the chance. I guess I should just embrace it.
Just wanted to let you know you are not alone.