I apologize to Galaxy, and everyone else for making light of this subject.. it was not kind, and I'm never unkind.. I am sorry, really.. I meant no disrespect, ever.
As for growth, -everyone- is different, growth is dependent on several things, genetics, hormone levels, strength of the drugs, bodys tolerance or acceptance of the keys to unlock the dna allowing growth.. just a lot of things.
I was flatchested a year ago, very skinny most of my life, with little fat on my body. When I finally began my transition, I started with herbal formulas, not a bottle of this, two bottles of that, oh, I'll try this too.. I went with a herbal program, compounded into single capsules for almost 9 months, twice daily. My mood began to change immediately, second day, I was in such a different place than the day before. Breast buds began about 3 weeks in. like chopped potatoes under the skin, small at first then more noticeable. They never, ever hurt, only itched.. a lot. an awful lot. They began cone-shaped, still small, not I could tell. I began to get more growth at abt the 8-10 week mark.. almost 3mos and I began to fear the family noticing them. When I switched from herbals, to 'script-based drug hormones in June, OMFG!! Shut The Front Door, wooooow, I had growth spurts that would push me backwards from the recoil!! I went from -AAAAAAA to these B's now from.. October '13 to now.. and I am still astounded my family has not noticed. there is just no way they cant. Oh.. And the pain..!! seriously, I'm amazed I'm still alive! Needles and pins isn't just a 60's song title to me anymore!! But my mother was biiiig-chested.. like GG, or HH's.. biiig, had a reduction when we were teens because of the backaches and spine pain from carrying those around. My sister is also pretty big, not as big as mom, but still kind of frightening, as trans girls get roughly a cup to cup/half smaller than their cisfemale family.. so that is still scary for me to envision.
Your growth is entirely dependent on your family. If they grew fast, or large, slow or small, its all genetics. Most girls begin in their early teens, and don't stop til their late teens or twenty's. I did not realize or think how the estrogen, Finesteride or progesterone is delivered could affect growth timeline. Maybe your body is just a little more resistive to the hormones, and needs a bit longer to unload the receptors and begin growth. give it time.
Again, I am sorry I made light of your first posts.

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added: I went back to the very first few posts, and re-read them.. I completely missed the point of the posts.. namely, how to deal with the sadness of them taking a long time to bud/grow, pop.. sorry again, reading comprehension was not my strong suite.. I was more of a math major

How to deal with the sadness, angst of slow growth.. hmmm, I don't know if it helps much, but as Liz wrote, cisgirls take years to begin growing, getting to the sizes they will finally be.. we all know some cisgirls begin and grow very fast while they are young, and are teased or embarrassed endlessly. For others, the boob train is nowhere in sight, and doesn't look like it will
ever reach the station. Some teens, proud of their first buds, demand they get their first bra while still looking very much like their younger brothers. And still others, are terrified that they will even begin showing. The emotions run the entire gamut. From joy and elation to downright terror. For many, it only takes Mom to sit them down and say, "Honey, everyone is different, your time will come too"
How to actually deal with it, I wish I could help more. Each of us has something that is just so knife-to-the-heart that we don't think we can endure it. Mine.. is my whiskers. I am not in a time or place where I can get laser, or electrolysis done. So seeing my beard, no matter -how- closely I shave every few hours, is my pain. Yours, is waiting for the growth. I wish you well, and an answer to your pain.
Paula