99% of the time our reactions to stimuli are automatic. This is why we practice mediation sitting still on a hard floor. It is not comfortable, with your legs crossed, your knees hurt, your butt hurts, it makes you feel you want to move, some one is sniffling, a baby is crying somewhere, it MAKES YOU FEEL annoyed,

It is possible to overcome the "MAKES YOU FEEL" part of this. External stimulus will always be there, but with some training, the only thing that "Makes you feel" will be you. You notice the pain in your knees, but it flows over you as water flows past the stone in the river.

This is easy to say but not easy to do. It takes quite a few hours of deliberate practice. Some people never get there. But, I think it is worth a try. Find a mediation class. Go every week.