Although external factors strongly influence our behaviours, it is technically correct to say you are both reponsible and accountable for your behaviour.

Responsibility

This noun can be interpreted with slight variations but as it applies to an individual it is primarily about the opportunity or ability to act independently and make decisions.

Accountability

This noun has a strong relationship to responsibility.  It refers to the acknowledgment and assumption of responsibility for your actions.

Feeling Peaceful

Proactively recognizing that taking accountability for things you accept as within your sphere of responsibility puts you squarely in charge of your life.

With this level of ownership worries, annoyances and frustrations need not exist.  By deciding how to deal with external influences on your terms, inner peace is achieved.

Consider this.  Is there any point to be frustrated, worried or anxious about things in your control?  Probably not.  If they are outside your control you can’t do anything so its does not make sense to waste time on them.

So logically as long as you take accountability and control you will never be frustrated, worried or anxious, in short a constant state of inner peace.

Too Simplistic

Emotions and human behaviour realities probably lead most to conclude this is interesting logic but not practical.    Before leaping to a conclusion it might be interesting to give it a try.

The success measure is simple.  Practice personal control consistently, then ask yourself, at any point in time, how do I feel? If your answer is consistently “ relaxed and happy” , than maybe  it does work.