As far as I know, the answer is no. It seems impossible for you to pass political examination. Political Examination is sort of background check but even more strict in some level. When I was joining the Party I wrote a full report of my whole family ( parents and grandparents and my uncles/aunts), to prove that none of my family had ever tried to endanger this country or the Party. I am not saying it will be that difficult to enlist but they do have similar stuff undergoing once you applied.
You need to know for most Chinese citizens there is a chance for conscript as long as they don't go to Uni, and if you made yourself to college or Uni or whatever higher education, the way to join PLA become volunteering. And for both of the two ways of enlist they'll run a political examination on you. In your case, when recruiters start running these it will be like " Where the hell can we find any information about your background and your parents'? We are not going to ask MSS (Ministry of State Security of China) for help, that's for sure. " So here it is, your parents will have to be Chinese citizens as well.
However, if you get married in China, with a Chinese citizen, and you insist your kid to hold Chinese citizenship (which is optional after your kid born in China, and one of his/her parents is a Chinese citizen, only you need to apply for it), he/she for sure can join PLA with no problem whatsoever, I can give u that.
But, where there is a will, there is a way. If you are 100% determined, then just do it. You are just 15, what you need to do now is to make a long term plan. If you want to join PLA as a soldier, you can not be older than 25. Rules are: if your education ends after high school, u need to be younger than 22, and with a Bachelor degree you can still join when 24 YO. If you have any skills/knowledge/specialty that PLA desperately needs, they will probably enlist you as an specialized technical officer or non-commissioned officer. Not necessarily combat skills, can be in modern technique, psychology, engineering or even multi-languages. And for that there seems to be not clarified age limit but still no more than 35 will be better.
Good luck man. You got a dream, you hold on to it, and you will make it.