1- I have played for 8 different clubs including loans
2- I wear the No.25 at my current club
3- I am a star striker but I haven't scored for AGES
4- I scored an important goal at the World Cup 2014
5- I was top scorer in 2011-12 Bundesliga

Huntelaar?

Yep

Klaas Jan

I thought about Huntelaar first, but I couldn't remember which important goal he scored for Germany......

Netherlands you mean. It was his late penalty in their 2-1 win over Mexico.

exactly.. I dont know why but I always think he plays for Germany

To be honest, I got confused too when I saw that he "scored an important goal at the World Cup 2014" and was "top scorer in 2011-12 Bundesliga"