Corrections: Mystery

When I was 5, or 6 years old I thoughused to think about: what am I really? 
This mystery has Nnever Mystery been solved. Now I 'm am 21yeras but I don't find have not found my answer exactly.
I just know I should try, to be happy, to help other people, and to be kind.
I don't know philosophy(Do you mean philosophy or purpose?) of this life. I think people hard(What do you mean here?) that with strange​ tradition, religion and how think about them other people.
Last night I thought  just a blue clothes is ready for tomorrow. And I Should iron other clothes.
I was very tired, I said to my self Mobina  that isn't important that wear this several times that important you love that and you want sleep now to be blithesome tomorrow. (what is the relation between this part and first section?)

Note:
You started this post very well. The main issue I see is the disconnect between first part of your writing up to 'other people.' and the second part that is in bold.

To Study:
http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/used
https://learnenglish.britishcouncil.org/en/quick-grammar/used-infinitive-and-beget-used