Hi İrem,
GPA is important but not the only criteria of CV assessment. Uncommon backgrounds like yours are being more and more appreciated in recent years, especially in BCG. As I mentioned some minutes ago to another candidate (https://www.preplounge.com/en/consulting-forum/help-needed-5216), international and entrepreneurial experiences are the aspects recruiters want to find in the best applications. Therefore your activities have been assessed as extremely interesting :)
Now focus on case preparation!
Good luck,
Antonello