The 23-year-old midfielder has joined Pompey from Tottenham Hotspur initially until the January transfer window, but O'Hara wants to see out the season on the south coast.
He told The News: "I'm enjoying my football and I'm playing every week. That's all I can ask for.
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"All I want to do as a footballer in the Premier League is play football.
"I say to myself how would it look to the Pompey fans if I left in January? They travel away and come to every game and we're fighting for every point.
"Then come January I pack up and go back to Tottenham and I'm back in the comfort zone.
"How does it look to them? Maybe it looks like I've walked away from a fight.
"I'm not that type of person. I want to be there for the team and the club. I want to help us get out of trouble."
Source: DSG