I also attended a Christian missionary school for six years. Up till my teenage years, I more or less regarded myself as a Christian. As to be expected, Christianity in where I come from is associated with ‘Western’ culture. So even though I grew up being fascinated by certain ‘Chinese’ folklore involving Buddhist themes, etc - not to mention my loving grandmother was a devotee of Guanyin who would seek blessings from the temple for her grandchildren - I was nevertheless taught to regard these customs with suspicion.
I was constantly being exposed to how I am ‘white’ and ‘non-white’ at the same time. How I am necessarily a ‘traitor’ on all sides.
Then I migrated to Australia where I have been living for the past 11-12 years. Throughout my university, work and social life, I have had to deal with the question: ‘Wow, your English is really good for a non-native speaker. Where do you come from?’ What do you mean ‘non-native’ speaker? I cannot think in any other language. What exactly is yours to possess and not ours to share?
It was in Australia where I discovered ‘Western’ translations of Buddhism, and felt a connection with it. I embraced it because it was very different to the sort of ‘cultural Buddhism’ I grew up with. I encountered the same criticisms I had encountered via Christianity: that the Buddhist customs of my ancestral heritage are to be viewed with suspicion. Once again, my inferiority is pointed out to me; once again I am asked to embrace 'whiteness' by disavowing my 'non-whiteness'. Yet, I very quickly began to see that even though ‘Western’ translations of Buddhism have a tendency to portray itself as a more ‘direct’ approach to the Dhamma, it is in fact thoroughly conditioned by certain cultural and historical forces – cultural and historical forces that I am intimately familiar with because these forces have been used to judge me as ‘inferior’ and at the same times have also worked to my advantage.
Cultural conditioning is inevitable, however as long as we are aware that feelings are fleeting, then the Dhamma is always there.
"You can never step in the same river twice" Heraclitus
The rest is just commentary to me and cultural accretions.
As for the rest of your post, I can sympathise with how you have been made to feel "other" and inferior, I get this myself quite a lot, it actually happened today with a passing comment from a colleague. However it is our reaction to these situations that defines us.
"inferior" and "superior" are mind made chains that we forge, no one else.