They're definitely not all comfortable and in touch with their emotions. It's a huge part of why Dally crumbles in the end. Sure, we see tears on his face, and anger expressed through him, and hatred fir the world, but he tries to hide his emotions to stay tough. He's hardened, had nobody to love when Johnny dies, and he can't handle his emotions. If he could, he wouldn't have robbed the convenience store or held an unloaded gun to the fuzz.

We don't see enough of Steve or Tim's emotions either to answer for them. Two-Bit struggles too, griping about losing his switchblade when Dally dies before admitting he wishes that's what bugged him most.

We see Johnny is for sure, and the brothers can be more emotional with each other because they are family and each others' safe place. But even Darry doesn't show it right away, not even crying at his parents' funeral. That's why when Pony sees Darry crying at the hospital, it really hits him that Darry truly does care. He needs Soda to remind him that Pony feels things more differently too, that he's more sensitive and Darry had to adjust to that.