customs and immigration – Am I over-staying in the Philippines? Japanese Dual citizen

I have been living in the Philippines since I was a kid. I was born to a Japanese father and Filipino mom, which makes me a Filipino citizen. A few days ago, I inquired about getting a Filipino passport ( which I haven’t owned since I never thought I needed it and my parents never got me one since I lived here. And i currently own a Japanese paasport. Unexpired). The officer told me that under the Nationality law in Japan, I could no longer get a ph passport because I’m past the age of 22 ( the age that Japan limits a japanese citizen to be dual). And that I’m currently a japanese citizen only. I have never returned to Japan since I got here. Does that mean I have been over staying here in the Philippines? How should I proceed?