Mourinho is in discussions over a new contract but it has been claimed he is so unhappy at Old Trafford that he is ready to walk away.
His commitment has also been questioned as he continues to live in a hotel rather than move into his own house.
"I say garbage. I don't find a better word than to define the talk," Mourinho said.
"The worst thing someone can do is put one inch of doubt into my professionalism, to every detail related to my job, so yes the garbage news affected me just on this aspect because it's something I don't admit.
"I repeat I am in the middle of my contract, if I am going to sign a new one it depends on the club but my commitment is total and I want to stay."
Mourinho, whose current deal does not expire until 2019, is in the second year of a three-year contract.
"I see myself here," added Mourinho. "It is just a question of the club, the board the owners, Mr Woodward, they are all happy with my contribution and they want me to stay beyond the end of this contract."
The Portuguese also addressed his apparent unhappiness at his present situation.
"Because I don't behave as a clown on the touchline? It means I lost my passion?" said the 54-year-old.
"I prefer to do it the way I do it, much more mature, better for my team and myself, you don't have to behave like a crazy guy on the touchline.
"The way a person is dedicated to his work, not what you do in front of the cameras."
It is thought that sources inside Manchester United have been bewildered by speculation over Mourinho's future.