Why do I feel calmer after burning my old journals, even though it’s just paper?

Name: Sanjana Ghosh.

DOB: 13 April 1997.

Time: 2:45 PM.

Place: Kolkata, India.

I have a negative journal, like a journal which has all my negative thoughts and all the negative images i get in my mind. So, as an act of releasing those negative energies.

I usually burn the pages of the journal and then I feel lighter. Is that my aura cleansing of all the negative energy? Or is it that, it is just my mind?