The 33-year old, who has been in fine form since he joined the Tigers in 2014, admits it was a tough decision to call time on his career.
“It wasn’t easy deciding to retire, I have spent the last 12 years playing and living in the UK, have been married and had two kids in that time,” he told Love Rugby League.
“I have built a life for us and met and made so many great people. It was very hard to decide but I am extremely happy with how I have played in the time over here and that makes me very comfortable with the decision.
“It’s always been important to me to finish playing well and have the decision to make rather than it be pulled from me through injury or lack of form.
“There is more to the playing side for me also. My wife has had to make huge sacrifices for me to stay and play here and she would stay forever if I wanted us too.
“But I would like her to have her career and without family to support us it’s almost impossible. So that was a key part of my decision.
“And I would like my girls to spend a lot of time with their grandparents aunties uncles and cousins, so they can have relationships and make great memories like I have of that time.”
Dorn has dabbled in coaching juniors previously and wants to remain involved in the sport in the future. The playmaker plans to return to his hometown of Maitland, near Newcastle, in Australia.
“There isn’t any concrete plans for me when we leave,” he said.
“I have been talking to my contacts in Australia regarding staying in the game hopefully in a welfare/player development role.
“As my career has gone on my interest and desire to work in this field has grown. I want to help players reach their potential on the field and be great people off it.”
Dorn revealed he also is planning his own business venture.
“I hopefully will be able to have my little coffee shop somewhere,” he said.
“I would love to have a little business to work at and not be told to run up and down hills.”
This season the fullback has managed six tries in seven appearances, with his campaign disrupted by a hamstring injury.
Castleford have battled injuries and inconsistency, but Dorn feels the Tigers can kick on now as fit players return in the second part of the year.
“We have had a horrible run of injuries as have pretty much every team in Super League this season,” Dorn said.
“It has been a huge amount I don’t recall anything like it across the competition. We have dealt reasonably well and I think that getting our core of players back now gives us a great chance of competing for both trophies this year.”