Words I'll Never Say

There are so many things I want to say to so many people, people from my past and present, but cannot for a variety if reasons. 

People always encourage speaking your mind or saying what you need to say (thank you john mayer). This isn't really possible in a number of situations though. 

I fear what consequences ny words would have on already sensitive situations, on already angry people, on comfortably oblivious or uninterested people, or on people new to situations that I am perhaps now considered to be removed from. 

Selfishly, I wonder, where does that leave me? When or how can I find peace? I am simply not the kind of person who can just "accept."  Letting go is hard enough, and when there are things left to be said, how can it really be done?