New Charlton signing Tony Watt hopes he can move on from a frustrating spell at Belgian side Standard Liege.
The striker, 21, has agreed a deal until the summer of 2018 after joining for an undisclosed fee.
"I was doing my best to learn French and fit in but sometimes it is not for you," Watt told BBC London 94.9.
"Unluckily that happened, but if you get knocked down you need to get back up and go again. You can't focus on the negatives and let it eat away at you."
Watt moved to Standard from Celtic last summer, having spent the 2013-14 campaign on loan at fellow Belgian Pro League side Lierse SK.
The majority of the Scot's 17 appearances for Standard this season came from the bench, and he scored just two goals for the club.
Charlton boss Bob Peeters believes Watt will benefit from a move back to Britain.
"He was struggling because he was in the French part of Belgium," the 40-year-old said.
"It is a different culture to when he was at Lierse, which is the Flemish part of Belgium. The language was a barrier there [at Standard].
"He is really hungry and wants to prove a point. The most important reason why we signed him is because he has got ability. Hopefully, he can be the player we think he can be."
Watt scored the winning goal for Celtic in their Champions League win over Spanish side Barcelona in 2012 and won the league title with the Scottish club in 2012-13.
The Scotland Under-21 international hopes he can rediscover his best form during his time in south east London.
"I think you go everywhere with something to prove," he said.
"I've had a few big moments in my career and I hope I can do other things like it and make even bigger moments.
"It's going to be difficult because I played for the team I love, and grew up as a boy wishing I could play for - I don't think there's anything else I could have wanted more than that.
"Now I need to go and experience something different and hopefully I can show England and Scotland what I can do.
"I don't think I'll ever lose my appetite for football. I just hope I can turn it into success."