The Perpignan fly-half has been capped 70 times for Wales, but has not started a game for his country in almost a year.
The 27-year-old told BBC Sport: "I love playing for my country, but it's really frustrating that obviously I don't fit in to the coach's plans.
"I'm not going to say I'm turning my back on international rugby because I love playing for Wales so much and there's so many players out there that would rip someone's hand off to play for Wales just once.
"They go for big players just to get over the gainline, that's probably why in the last two years I haven't figured in the plans. So whether it's frustrating, I've just got to knuckle down and do well for my club."