I reached Washington Square Park oblivious to my surroundings. I remembered that I was not there to sit and think about the things that had happened and were happening to me, but to take my mind off so many unnecessary things. There are two many 'things' in your sentence; try to choose a more precise word.
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Mister Micawber...try to choose a more precise word.Could I possible say to relieve myself of so many worries instead of to take my mind off so many unnecessary things?