@nicober87
I think everyone had said pretty much the right things so I haven't nothing to add to what Dominique had already outlined.
Personally, I think you are on the brink or maybe perhaps past the brink of doing something wrong in your diet.
What I am seeing here is a diet focused on more protein intake and less calories plus some intense workout; if insanity and your Brazilian butts workout gave me that impression, then I think you are probably on more of a caloric deficit than it is safe to be. Your BMI to me indicated that you are already on the precipice of underweight or maybe already underweight because what you are describing; difficulty of gaining muscle mass and bony upper body features are a sign of undernutrition or malnutrition. Malnutrition or under nutrition is basically an inadequate amount of nutrients, vitamins and the macros and a person tends to focus on eating too much of one or a few things and less calories. And with the craze in everything "Protein" however, a person may not have protein energy deficit, but some dietary deficiencies because they lack the balance of the other food macros, because they cut them out -- namely carbs because carbs is the enemy! Carbs isn't the enemy, but because the focus on specific macros and low calories cause people to shun carbs and hence get themselves in undernutrition. And because consuming a lot of protein can curb your appetite and make you feel full, it also prevents a person from consuming the other necessary nutrition and vitamins causing the person not only to lose body fat, but also muscle tissue. The upper body is usually the first thing to go (think those people now starving in Venezuela before a certain sitting president lost weight and low upper body muscle mass/tissue). Bony features; bony skinny face and more prone to dry skin and feeling cold more than often if you haven't felt them already. The so called crash diet works because it encourages losing of body fat, muscle tissues by letting the body convert them (muscles into glucose for fuel). Malnutrition also discourages cell growth and repair, so it doesn't matter how much weights you do, because there's no cell growth, there is no muscle growth. What are you telling me so far and thus far is what I had commonly seen in patients (I work in nursing). Patients who are on the verge or are malnourished.
The lower body parts are usually the later to go as the butt areas are comprised of 3 muscle groups; the gluteus maximus, medius and minimus are big muscles and the fat surrounding them and people usually go to the extreme and restrict their caloric intake even more, thus promoting even more undernutrition which is not a good thing to do. Since your internal organs are also composed of muscles, the body doesn't know and doesn't care. It takes what it needs and consume what it must to keep your brain and central nervous systems alive, so literally you can have the body literally eating you from the inside out. This is what you see from people who work as super models. You can try to be as thin as sticks as like them, but they don't stay in that body forever. Usually, they do this for a specific job or work and then they go back eating enough calories so they are not malnourished. Same with athletes who work themselves so thin with such low body fat that it is only meant to allow them to compete more effectively to win, but during their down days (when not competing), they go back to their normal weight with a higher than sub 20% body fat. You are NOT MEANT to be in the sub 20 body fat forever and certainly you are not meant to be in the sub 15 BMI forever either. Unfortunately, magazines and the diet industry tell you that you must and you need to for some certain look or certain acknowledgement as though looking abnormally thin makes who you are, rather than your contribution to the community and service to society than promoting self-interest. I work in nursing who are taking care of people who were former body builders and models and now, as they are older, have all the usual body problems and ailments that you expect when you force your body to shape like you need to fit through an eye of the needle.
Anyhow, I'm not trying to scare nor dissuade people to do whatever they like to do with their body. After all, it is all of you who helped fund our jobs, our health care and lots of clients who need us to fix your bodies. But if you break something internally; which most people do when they go extreme dieting, there is no reliable medical treatment and technology that can fix those broken parts.
Sorry to sound so hawkish, but I just see way too many of these issues crop up because some diet guru and fad tells you that it is safe. And yet, it's always you that ends up paying whatever medical bills that comes next.
A balanced diet with enough calories and a set of strength training, resistance training and mild cardio workout had always been the staple of good health, good muscle growth and low body fat sustainable for many years of life for any individual.
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