First things first: bodybuilding take a
long time. Do not let the advertisements that are all over the place that state you can make drastic physique changes in 8 weeks or less. Bodybuilding is all about patience and perseverance. This picture is intended to give you a better idea of time, I have been lifting 5 days a week for a bit over a year now. And it's taken that long to see this sort of change, even with testosterone.

Also, don't compare yourself to anyone, and especially cis female bodybuilders. A lot of female pros (the especially large ones) take some sort of steroid. I'm not saying anything bad about that, because they still work har and don't magically get big from steroids, but their physique is not "natural".
In terms of nutrition, to get bigger you have to eat at a caloric surplus. It's that simple. (Well obviously you have to work out hard too). But your body cannot create something from nothing. There are plenty of online tools out there to help you figure out what your daily caloric needs are, so that. Then try to achieve eating 250-500 calories more than that each day.
I can definitely understand the struggle, it is actually very difficult for me to eat a lot, I literally have to force myself sometimes. There are even some days that I'm not hungry at all but I need to hit my calories and eating is not enjoyable at all.
An easy way to eat more calories is shakes. Everyday when I get home from the gym, I make this shake and it yields about 650 calories.
-1 cup of 2% milk (you can substitute almond milk)
-1/2 cup raw oats
-2 tablespoons of peanut butter
-2 tablespoons of nesquik
-1 scoop of protein powder
Sometimes I'll even throw in half a banana. Tastes awesome and an easy way to hit those calories.
If you're truly looking to build more muscle to your physique, I definitely recommend an actual gym.