It's okay to be vulnerable here, @Wakanda :). We hear you.
From what I gather, your silent compliance stemmed from necessity rather than choice. When you say there were "popularity contests" among your relatives, I can just imagine the pressure you must have felt to internalize all your struggles. After all, any sign of less-than-perfect conduct is a reflection on the whole family's "reputation" in the congregation and the extended relatives. I find familiarity with you there.
While this childhood oppression you underwent may have given your short-sighted parents a handle on any challenging behaviors and emotions you would have naturally felt rising within you, it only served to store up a huge amount of difficulty later on in life... because, well, here we are talking about the "love" your parents used as a currency on an anonymous forum decades later.
I'm so sorry that your real thoughts and feelings got buried back then. I can only wonder how many more of the present generation of JW youths are also becoming the keeper of too many secrets, and appalling communicators of the many unpopular, yet important things needing addressing.
Another significant issue with the perfect JW child is, they have no experience of people being able to tolerate their badness. They've missed out on a vital privilege of a healthy child - that of being able to display envious, greedy and maniacal sides that could yet be tolerated and loved nevertheless. Instead, they are forced into a version of reality where, unless they remain in order, they are otherwise unlovable. Given your own memories and recollections, we both know children aren't stupid - they can tell when things just don't seem quite "right" in their family ideals.
The sociological breakdown of adults in the religion suffering from ailments is a well-covered issue, but I do wonder now how many psychosomatic symptoms are actually being generated in the pre-teen strata since you've mentioned your own case. This may be an area worth us investigating.