The 30-year-old former Bulgaria captain has been strongly linked with a move away from Old Trafford but he said he was determined to fight to regain his place.
"I'm a Manchester United player and I'll be glad to fulfil my contract," Berbatov told Bulgarian 24 Chasa daily.
"Everyone is going through some difficulties but I've always been fighting for a regular place and I'll continue fighting for it. I never gave up in my life.
"On July 4 everything begins all over again, the battle for the cups, the battle for the regular places."
"I was disappointed," said Berbatov. "I was ashamed that I was left out of the squad.
"And that's why I didn't want people to see how sad I was... because I can't hide my emotions.
"I preferred to stay on my own in the dressing room.
"I had many happy moments with United," said Berbatov. "We won the 19th title and I became the league's top scorer.
"I'm very proud of it. I came to England from a little country and I know that during every training session, during every game I have to be better that the others because I'm a foreigner.
"To be the top scorer in England is just fantastic.
"They're all precious," Berbatov replied when asked about his most valuable goal of the season.
"But, of course, I can't skip the Liverpool hat-trick. To score three goals against Liverpool is a great achievement and the fans always remind me about it, so I just can't forget this one."
"Manchester United is the biggest step for me," he said."Everything beyond United is a step back."
