Why should I just keep quiet?

Why should I keep quiet in church? I don't see things the same as others in the chapel, but I don't want to offend anyone. I want to keep my temple recommend and my membership. So I must be quiet.
Why should I be quiet in my family? Again, I don't want to argue, or to hurt anyone's feelings. So, I keep quiet.
The result is that I participate in small talk, nothing really important, nothing that really matters. And I feel very alone, and very quiet.
Freedom of speech... what a joke!