Why is it so hard to eat a lot of protein without consuming a ton of calories?

I decided to go back to counting calories because I’m trying to keep track of my macros. I need to get in around 100 grams of protein because of deficiencies etc.

I need low calorie *high* protein vegetarian options, if any of you have suggestions 🥲

I’ve been mostly consuming eggs with cheese, high protein boosts (250 calories, 20 grams of protein), and Premier Protein bars (200 calories, 20 grams of protein).

I have a habit of being a picky eater 😔 but I need more than just a ton of eggs and protein drinks/bars. The way I make my eggs probably add a lot of calories because I like them fluffy and actually good, so I use butter and whole milk for when I scramble them.