By Gabriel Tan in Bangkok
The War Elephants failed to end their ten-year hunt to win Southeast Asia's biggest prize as they fell to a 3-2 aggregate defeat to Singapore in the final.
Despite winning last Saturday's second leg in Bangkok 1-0, the damage had been done three days earlier when they lost 3-1 at the Jalan Besar Stadium.
But despite having to settle for a runners-up medal in the end, Jakkapan insists he is pleased with how his first international tournament for Thailand went.
"For me, I think I did okay in my first tournament for the national team," he said. "I'm happy with the form I showed.
"I'm happy with every player and we had good team spirit, but we must look to improve in the next tournament."
The Muangthong United winger admitted the War Elephants had left themselves with too much to overcome after the first-leg defeat in Singapore, but believes they can be satisfied with what they achieved overall.
"We gave everything [on Saturday]," Jakkapan added. "It's the result in the first game that made our jobs really difficult.
"But [on Saturday] we gave everything and we played well. We won but it proved to be not enough.
"When you lose by a big margin in the first game, it makes things difficult and that's something we have to do better in the future.
"I think our team did well in this tournament. We did well for Thailand."
Jakkapan was part of the Muangthong side that won the Thai Premier League last season after ending the campaign unbeaten, finishing 14 points ahead of second-placed Chonburi.