Playing Football

I was 6 years old when I decided to join in a football team for children. I clearly remember the day when I talked to my dad about my decision. He knew how much I have loved it so he was completely agreed. It was one of the best days in my childhood I guess. Playing football is a good opportunity to make friends, to be part of a group and it is also healthy. Even if most of the time I have came back at home really tired, nothing it could be more satisfactory. Indeed, I still haven't gave given up. As far as I am concerned I strongly recommend having an hobby like mine, especially If you start practicing quite early.

Well-done! Keep up with the good work :)

Playing Football

I was 6 years old when I decided to join in a football team for children. I clearly remember the day when I talked to my dad about my decision. He knew how much I have loved it so he was completely agree(.in complete agreement) It was one of the best days in (of) my childhood I guess. Playing football is a good opportunity to make friends, to(not necessary to repeat the infinitive) take part in a group, and it is also healthy. Even if(or 'though'), most of the time I have came back at home really tired, nothing it could be more satisfactory.satisfying Indeed, I still now, I haven't gave haven't given up. As far as I am concerned I strongly recommend to have having an hobby like mine, especially If you start practicing quite early.

You did well, just practice using the present perfect and past tenses.