LeBron James vowed improvement but said he has been buoyed by the Cleveland Cavaliers' fans after a disappointing NBA Finals loss to the Golden State Warriors.

"It hurt to lose," James wrote Tuesday in captioning a Facebook photo of children in his LeBron James Family Foundation at the Cedar Point amusement park. "I've been in a funk lately, but this... this is what motivates me to do what I do. How can I ever be down when I know my kids and my fans have my back?

"Thank you for an incredible season. I'm not satisfied... I'm not happy with the way things turned out... I PROMISE to get better," LeBron James wrote Tuesday on Facebook. AP Photo/Tony Dejak

"Being back home and back with my fans is everything that I dreamed of. Thank you for an incredible season. I'm not satisfied... I'm not happy with the way things turned out... I PROMISE to get better. #StriveForGreatness #ILoveTheseKids #GodBlessOurFans."

James' post, his first on social media since April, echoed his remarks in a Bleacher Report video from Saturday.

"I'm trying to work my way out of [a little funk]," he said in the video.

James addressed Cavaliers fans in the video, saying that while he was "not happy with the way it closed out," he was pleased with the effort shown by his teammates this past season.

"You know, for a team that's first getting together, in our first year to be able to reach the Finals -- not saying I'm happy with the results, but I'm proud of our guys," James said. "Just the growth that they had from the first day we walked in the gym to the other day, us losing, I'm proud of the guys and what they was able to accomplish."

James also said he already is looking ahead to next season.

"Hopefully I can put our team in position once again to try to compete for a championship next year and year in and year out," he said. "That's my goal, and my inspiration hasn't changed."