I have a few early concerns and questions about what various methods and treatments can and can't do for someone like me. I have an....odd body shape, to say the least. I'm no expert in anatomy, but I wanna say I have a mix of endomorph and mesomorph. What bugs me most is my upper body. From the front, I think I can safely say that my shoulders don't look too broad. I have a decently sized stomach, though nothing compared to the majority of biological men in my family and I am the definition of couch potato. I do wish my neck was not as thick, I can't really say if that's genetic or not since I'm really the only biological male I see in my family often who isn't considerably overweight. My neck seems to be quite muscular, especially in the back view. From the back however, I have a very large back basically, lol. I'm also pretty short for a biological male, I'm only around 5'5 or 5'6, and I'm 19. I began puberty very early so hopefully I'm done growing heightwise. I also can barely see any waist from the front, but from behind it's a bit more noticeable. I also have these permanent muffin top sort of things right over my hips that seem to make what is visible of my waist show. When i stretch that fat, my waist is even harder to see.
But yeah, my back is huge, and it looks like I guess you could say, flabby and muscular at the same time to me. I haven't worked out much at all in life though, I only played a somewhat small amount of sports as a kid, well before high school. I'm not so good with anatomy, so I'm not sure if it could be due to a big rib cage or my shoulders or an overall large frame (I'm sure I do have one, I can't touch my index finger and thumb together when I wrap them around my wrist even though my wrist is pretty slim) or what, but judging by the difference in the frontal and behind view, I'm not so sure it's my shoulders. Looking at myself from the front kinda gives me hope for HRT and such in the future, but turning around scares me. Ugh I hate my back so much

What's weird to me is that from the front, I don't really feel like I have too large of a frame, but from behind I look huge imo.
Anyways, my main questions are these (and they've probably been asked a billion times, but with all my searching I rarely find before/after HRT back pics):
1. Am I doomed to have a large manly back forever even with HRT, or will they reduce it a lot? And if my shoulders look okay to me from the front, is it likely the back is actually mostly muscle which I've read HRT and other things can diminish? I'd like to mention, most of the women in my family are overweight, and particularly on my dad's side, do have a very large frame. On my mother's side it's the same except most of the women have a much smaller, but still by no means tiny frame. 2 aunts on my mother's side are actually pretty slim and petite though which makes me pretty happy as the genes are around somewhere and that's what I'd like. I have gotten some of the very desirable genes already from them (really good teeth for example)
2. Because I physically resemble my father more in most ways and I look like a more masculine version of his family's women and in some odd ways less so, is it probable that I would end up with his side of the family's genes for fat redistribution? I mean, I have narrower shoulders in the front than my sister, but she obviously has a much more noticeable waist and smaller torso overall besides her boobs (both sides of my family have huge boobs

)
My back looks to me like it wouldn't be very malleable in its size, but hopefully that's just ignorant assumption on my part. Judging by the results I've seen on this site so far, miracles can and do happen with HRT alone. I can provide pics if it would help with advice giving, but I'll go ahead and issue a vomit warning! Thanks for any advice and help.