Travel To A Different Country

Okay so as a part of my contract i have the opportunity to volunteer for 3 month in Asia with an ngo in 3 months (im thinking of Japan,Malaysia,Indonesia or Phillipines) which is gonna be an amazing experience to add in my resumé to apply for a master degree in fall 2024.
But I come from a traditional family (where girls don't usually leave the house if they're not married) AND my mom is the most anxious,scaredy cat I know.

To me there is no doubt that I cannot let this opportunity go, I'm gonna regret it or worse resent my mom. Also lol i knew she wouldn't agree right away and that now since i told her the news it's gonna be really tense everytime i'll mention it cuz common I know it's a mother's job to worry.
But my problem is that i'm a non-confrotational ppl pleaser and I lack a lot of confidence. Everytime I go against her wish i feel physically bad and stress even tho her wishes don't align with mine. And on top of that I second my decisions a lot bcz I don't trust myself.
I know I want to go, do you guys have any advice on how to not loose all resolve the minute my mom will talk (or scream) me out of going abroad ?