{correct my english} #2 The only one but definitely the best

If you do something (whatever it could be) feeling indifference to this activity - you can suppose you did not do it at all..


It is funny but I got this thought while in a turkish sauna.

or "while I was in the turkish sauna" would equally suffice

A turkish boy looked bored and had an indifferent expression on his face scrabbing at me. After I went out of the sauna I understood that even if he cleaned my skin really well, I still feel felt like I needed to wash my body. (parallelism of verb tenses: understood -> cleaned -> felt -> needed)

After I went to get a massage ( it was not too good to be honest). Those The massagist was passionate about his job and looked happier himself. I clearly saw the difference. The most important thing is not only what you can offer to others but  you feel happier yourself feeling happier about yourself 
Again, this rule is relevant (applible? yes it's applicable ;) ) for many life situations. For instance, if you lived your life beying arrogant, and superficial, and you didn't use all your potencial, you feel unsatisfied in the end. You [would] need to have one more life! [But] I am sorry to say that it is impossible. It is not the sauna, you can not go there again (OR "you can not return [to it]")
Eventually, I have decided to live expressing feelings and to do my best on all levels ("aspects" would be a better word): physically, psycologically, as a daughter, as a friend and so on.

Your command of the English language is quite impressive. Just don't forget to make verb tenses parallel (to live... -> to do ; understood -> cleaned -> needed; etc.)
Also, one area you really need to improve in is the usage of indefinite and definite articles (a, an, the). But overall, it was a commendable effort.

If you're interested in polishing your already brilliant English even further, contact me, and I would help you improve your compositions while I learn some Russian (haha). In any case, have a wonderful day, and thank you!