cb7921 it's not ungrateful to live your life in a way that you know is right for you. They may be well meaning but they can't really know what you've been going through all of these years and look upon or understand it the same way you do - they simply lack the context and experience for something like this, and it doesn't help that being trans is still a huge social taboo with tons of stigma attached to it, with little general awareness.
I think it would be far worse, especially in the long run for you to build and hold anger and resentment towards them and suffer in silence/self-repression than to have to take a break for a few years and meet on more amicable terms
It definitely pays to be prepared for the very worst case as you seem to be. Things will undoubtedly be difficult in the short to medium run but you'll likely learn to handle them as you go forward, as so many others have done before us.
Think for example you decided to marry for love and your parents didn't approve - a lot of people in this situation still go forward and get married anyway with or without their approval. As you may have seen/heard of with such scenarios first-hand, at first this heavily strains their relationship and may go no-contact, but a lot of them reconcile and accept this new reality over time - this is analogous to when you come out as it puts a wrench into their plans/aspirations for you in a kind of similar way - you have to do what you know is right, and hope that the rest of the world will eventually catch up and understand (or at the very least tolerate) over time - you are not at fault for being yourself
Please do read the stories on those reddit threads and the boundaries bit - it may definitely help with this to know that you're not alone and more importantly that you are not at fault here
Regarding educating them, those YouTube videos and articles are very beginner friendly and they may help them form a better understanding of what you're going through, but at the same time, everything around them and their current world-view and experience likely tells them to despise and fear this aspect of who you are (likely going though the cycle of denial/grief I shared earlier) - so it would be reasonable to expect them to take a long time to fully process things and to reach a reasonable level of acceptance (if ever)
Personally being mostly independent and setting strong boundaries with distancing and taking time apart as needed, though difficult (especially at first), really helped things along, apart from educating them patiently and persistently, and with time things could get better but I don't pin/revolve my life around their acceptance - I'll do my filial duty and be there for them always if and when they ever need me, but I will only live life on my own terms, and I strongly believe that it's unreasonable of them to expect me to do otherwise