The buds take a while and might be firmer still because they're closer to the muscle itself, later on when they are larger and round out more, boobs feel more like when you press a bit in the butt (albeit slightly jigglier and more sensitive like your lips).

Soreness is normal in growing boobs, esp when pressing (or when you're breastfeeding).

Other than that I don't know - as another has said, touch your boobs every now and then to feel.

hi friend! i'm transmasc so if i'm overstepping by replying to this thread i really apologize, but, when i still had a lot of breast tissue i also had a high tendency to experience what are called "fibrocystic breast changes", which are benign and happen due to hormone shifts but can make areas of tissue feel lumpy/hard. that might be what's going on there! it's also not uncommon for fibrocystic areas to feel sore or tender. really hoping that it's that or something else similarly normal/benign for you.

Oh no. I'm sorry that's happening. Big hugs 🫂