The Portugal captain previously stated back in September that he was unhappy with certain people at the club, but has now indicated that his mood has changed.
However, the 28-year-old is unwilling to discuss a contract extension with the La Liga champions.
"Yes, something has changed because I am doing what I like, which is playing football and I feel very good on the field and with my teammates," Ronaldo said. "Maybe I have also changed my way of thinking and being. At this moment I feel better than I did then.
"I am not going to talk much about [a new contract], because the truth is that for me the most important thing, what is in my head and my aims, is that Madrid wins the Champions League and the Copa del Rey.
"The contract renewal is a subject I do not want to talk about. It does not concern me now. The only important thing now is the team and we will speak at the end of the season. I swear by my son that my 'unhappiness' was never a question of money. It was not."
Ronaldo's current deal at the club expires in the summer of 2015.