Jackson was handed his Ireland debut during this year's RBS 6 Nations, making his bow in the 12-8 defeat to Scotland before starting again against France and Italy.
Ireland drew with France 13-13 at the Aviva Stadium and then lost 22-15 to Italy in Rome, a match in which fly-half Jackson kicked every single point.
However, with the squad for Ireland's summer tour of North America still to be announced, the 21-year-old wants to return to the kind of form that saw him selected in the first place.
"It's hard not to hear some of the comments," Jackson told the Irish Independent. "You cannot sidestep all the comments that are made.
"In the end, it's what your team-mates, friends and family think of you as a player. Most importantly, it's what you think of yourself.
"Of course, some of the media criticism dented my confidence at times and it was hard to come back from it. Now, I'm just keeping the head down and learning.
"I'm still young and I know I still have a lot to prove in the game. I'm now intent on getting that sparkle back in my game that I had at the start of the season.
"But playing for Ireland is what I always wanted. I just hope that I get another chance to win a few more caps."