Men (generally speaking) want to fit into the social dynamic of their tribe. If you started to slowly open up and talk about more vulnerable topics it's very likely they would follow suit. I've seen it many times, almost always where I was the one that started it. I was once a super 'introverted dev' but really I was just not well socialized and unwilling and unable to express my emotions with confidence and clarity. Once I started to feel my feelings (I started with a feelings journal where I'd write down any emotions I felt that day) then I could start to describe them appropriately for the setting. Opening up to a trusted member of whatever tribe you are in (work, friends, hobby club) at the appropriate pace inspires a great deal of trust. If you talk about how you feel openly (and again, appropriately to where the group is) they come to trust that you will say how you feel when you feel it and that inspires trust and security, which makes you a very valuable member of that tribe.