I think you have a point to a certain extent, in that people deal with stress, emotions and overwhelm differently.
That said, you have have articulated it very poorly & also don't acknowledge that your finances and support play a huge part in that.
I don't get anxious or overwhelmed either but it's very clear to me that I've far less stresses in life with many people & that's one hell of a fortunate position.
You can't even being to compare your situation to that of many others.
I'm pretty resilent but a hugh amount of that is due to how I was raised. Massively so & I was was in my 20s before I realised just how good a job my parents had done.
I was raised by what I can only describe as parents who made sure I always felt, safe, secure, loved, appreciated etc. Always shown the upside of everything. There was no fear but there were boundaries.
Most things were never bad enough that they wouldn't be fixed. Things were broken down into well if can't can you X what's the next best alternative and plan to that.
We were thought how to adapt from a very early age. How to deal with disappointment, worry, fear, jealousy, sadness etc.
We thought how death and illness are always going to happen but I remember even at a young age...to think about all the positives, all the good memories where far better than never having that person in your life at all etc.
Commmunication was strong in our house. Expressing emotions was common place.
Finding ways to deal with them was paramount.
Unwind the emotions, discover what's causing them, and plan for improving things.
That's why I'm resilence. I was taught how to be from a very young age.
It's a massive privilage to have been raised in a way that makes coping with things easy. Not everyone is that lucky & I'm surprised you don't realise that.