I have been known to be pretty sensitive before, it made it more difficult because I am empathetic too.
Though currently in life I find I am more centred, detached, objective. I guess it helped to do some inner work and self exploration, to see things from a vantage point, ground down and not take things personally, being self aware and mindful of my emotions, etc.
In high school I would usually try to keep it in and hated how I cried all the time so easily. Though when someone pressed a button too far I would explode [and then regret it later...]
I am the type who would like to wear armour and a mask in front of strangers and outside my home, but once I am at home, it is like an ocean flooding over and even at home I will need space to myself by myself [kind of like a cat]. I find I am more free with my emotions at home, it is that comfort zone where you can't help but let loose.
Sensitivity could also just be a reactive/subjective state of mind or a lot of repressed emotions that burst forth because some were never taught how to express themselves in a healthy way or were conditioned not to from childhood.
Perhaps it could be we just sense/feel more,like a 6th sense? Like how some have sensitive hearing or sense of smell. It is like someone who wasn't really built for this harsh world and haven't really adjusted to it yet either so they can feel really overwhelmed by it all [this could depend on the person though]. but I feel it also helps us connect to others easily like littletwinclouds described, makes us aware of how our actions can effect others because we know how it feels and it could mean we have a lot to give which is different to what this world is used to.
Also EMOTIONS = Energy in motion = not good for you if you keep that stuff locked up.
Whether your sensitive or not though, there is no wrong way to be. Everyone is different yet the same, It is all experience.[ as long as no one gets severely hurt/traumatised]
Of course that is just my take on it [ sorry for the rant]...
It is new for me to share this so thanks for this thread