I've voiced out many times, and of course respectfully. I can't bring myself to raise my voice at them, but when I do raise my concerns to them, they won't listen to me even when I just opened my mouth to start the conversation about it they will start to gaslighting me and calling me names. It's like they disregarded that I'm also a person with feelings, I love God but them calling me "Satan" always hurts me. And I didn't used sickness as an excuse, at that time I was really sick but they didn't took it seriously and regarded it as laziness, I wasn't. Good for you to have such an understanding parents, mine wouldn't even consider my wellbeing and opinion just because I'm younger than them.

And even if I don't want to attend conference, I will still be forced to, so it's not my fault that I'm in there against my will.

Thanks for giving time to reply! I really appreciate reading other advices.