Why 'can't' you just talk? Is it just because you're embarrassed to stutter or it makes you feel too vulnerable? Because those are unhealthy mindsets and the best way to smash them is to just expose yourself to it. Sounds like your friend is giving you a great avenue to that. However, if your stutter is severe enough that it's causing you physical harm whenever you speak, or is absolutely exhausting, then you should tell your friend that. My in-laws always used to go on and on about how they wish I'd talk more, that my stutter didn't matter to them. I had to explain to them that my stutter matters to me. It's awful to worry about losing bladder control when I'm speaking, or risking mouth injury because of my biting tic. Or to spend one evening struggling through conversation and coming out of it with a sore jaw, physically and mentally exhausted, and horribly frustrated because even when trying my best, I've only managed 25% expression, and it feels hopeless, which is not a healthy mindset, either. People can definitely underestimate the 'cost' of our speech disorders. It's not always just social. It's physical and mental and emotional, as well. Both things deal with this: take care of yourself. Sometimes that means rising to challenges and confronting the things you avoid. Other times that means picking your battles with your own motor control and choosing to remain silent. It can be difficult to sort out which is necessary at any given time. Just be true to yourself.