I-526, retrogression, CSPA

Sorry if it’s a dumb question! I apologize in advance that im kinda confused abt this although i googled around a lot:( Could someone explain my situation?

My parents submitted I-526 in 2016 when I was 16. We’re from China mainland so how does retrogression affect this? What should happen after? What is the chance that I can still get the green card under CSPA?

Tysm!!