How to know that one is meditating rightly?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

Questioner (Q): How does one know that she is meditating rightly? Secondly, I know that one should not be dependent on others and one’s happiness should always come from within. Yet, my emotions erupt and I react due to the actions of the other person. So, how to stay detached from everything and stay…