First decide if losing a lot of weight or building up a lot of muscle is going to make you look more masculine. If you are very short and curvy then you might want to focus on losing weight and getting as thin as you can to minimize hips, thighs, and breasts. If you are long and thin, then I would focus on building up muscle in the upper body to broaden your shoulders. It is very difficult to do both at once as you need a surplus of calories in order to create muscle, which can inhibit your weight loss. Right now, I am both losing a little weight (in my butt) and gaining muscle at the same time--it is possible to do, but the results will not be as good as if you focus on one. I can tell that both are happening because my hips and butt are shrinking while my shoulders and arms are growing (plus my legs are twenty times stronger than they were a few months ago), but I am around the same weight as I was then--muscle is replacing fat. But I could probably gain more muscle if I was willing to gain a little fat instead of lose it and was eating more calories. I would also probably be losing more weight if I was willing to halt my muscle gains and eat less calories. Instead I am going for a middle ground. However, I am on T which helps with the weight loss AND muscle gain. Since you're pre-T, I would pick one. (I am actually eating 2,200 calories a day, so I'm still eating a little in excess of what I need for the muscle growth.)
I can't tell you much about weight loss as I was already thin, but for muscle building I would get some 15 and 20 pound free weights and start working your biceps, triceps, and deltoids. Don't neglect the triceps or your arms will look weird. The deltoids are what will really broaden your shoulders. (You can Google basic exercise for all of these.) Don't neglect your lower body, but focus mainly on the upper to broaden the shoulders and arms, giving you a more balanced figure. Pull ups and push ups are good.
For diet, I am not an anti-carb dieter and prefer a diet that is 20% fat, 40% protein, and 40% carbs. I use MyFitnessPal to track the macros of everything I eat. I am not a bodybuilder myself, but my gym is a competition Olympic weightlifting gym, and this is the percentage of each type of food that most of the weightlifters are on. I don't eat empty carbs, though, sticking to whole grains. Get some protein powder and protein bars, otherwise you are unlikely to make a 40% protein macro level everyday. Peanut butter, Greek yogurt, and chicken are your BFFs.
