So many of us are resistant to the very act of letting go. What we could do better to realize is that letting go is very much a part of living. We are alive because the systems that make us bodily human are constantly taking in and letting go so that we are in fact alive; thriving and surviving.
Give yourself permission to let go.
People around you may be curious as to why it seems so easy for you. They will want you to react to situations dramatically and in fact in a way that is less peaceful. That is likely their way of being and all they know. It would be their response. Choose yours.