In James 5:16, James clearly teaches us that we must confess our sins to one another, not just privately to God. James 5:16 must be read in the context of James 5:14-15, which is referring to the healing power (both physical and spiritual) of the priests of the Church. Hence, when James says therefore in verse 16, he must be referring to the men he was writing about in verses 14 and 15 these men are the ordained priests of the Church, to whom we must confess our sins.
My observations have been otherwise.
Both in my life and the lives of my fellow parishioners, I've observed that
simply plainly applied the Scriptures in James about confessing--most typically to those whom they needed to confess most to--those closest to them as well as those they'd offended etc. by their sins, selfishness, thoughtlessness, pride . . . rebellions and idolatries
In my experience, simple faith in God and His word
Personal ping to some possibly interested in this pontification.
And, of course, I also believe in the Priesthood of all Believers.