At the time I was in Japan I was left to choose between Porto and Atletico Madrid but I preferred Porto because I thought it would be easier to adapt.
I hope to stay many years in Manchester United and make history in this club. When I was at Porto and Atletico Madrid, I always wanted to improve to achieve my dream of playing in a team like this.
I think the greatest Real Madrid player of all time is Cristiano Ronaldo followed by Ferenc Puskas.
Ronaldo equalled Puskas’ great record of 242 goals in fewer games.
He was also the fastest Real Madrid player to score 100 goals and holds the record for most goals scored for Madrid in a season.
My debut was in a final. I was not nervous. I scored a goal, and I won my first title. In all my debuts, I've always been able to score goals, and I have come to Madrid to stay and score many goals.
During my time at Juve, I didn't score more than 20 goals a year, but I won every title except the Champions League. I've scored 15 or 16 goals, and I've lifted titles, and other strikers have scored 35 and haven't won anything.
I was a fan of Henk Groot, former striker of Ajax, who scored many goals with his head. I thought, 'I can do that also,' but I couldn't.
I've played three seasons at Real Madrid; I've given my all. I've scored goals, I've won two leagues, and that's not easy.
I have always had sympathy for Atletico Madrid because, among other things, I have friends there, and my father always liked Atletico.
My time at Real Madrid wasn't a failure. I played 120 matches, I scored 28 goals, and I played an average of 30 games a season. What's more, I won three trophies: La Liga, a Copa del Rey, and a Supercopa de Espana.
I went to Italy as a 21-year-old when I could easily have stayed in Argentina, playing for the biggest club in the land, River Plate, and having a nice, comfortable life.
When Atletico tried to buy me back, I did everything I could to make it possible. I had offers from clubs in France and Italy, but I would not have left Chelsea for any other side - only for Atletico Madrid.
If I had gone to Madrid, I would have scored more than 200 goals, but I knew I would have got bored.
I would not be worried about the physical aspect of the Premier League. I have scored goals in Argentina, Portugal, and now Spain. I am confident I can adapt my game to any league.
Winning the Europa League with Atletico Madrid and then reaching a semi-final of the World Cup is great.
I always wanted to score goals, but sometimes I've scored and been terrible and other times I felt I played well and didn't score. I looked at the statsheet the season where I scored 27 goals and I had one assist and was frustrated.
Like I've said many times before, I'm always more likely to remember goals for their importance rather than if they're beautiful or not. Goals scored in finals, for example.