Biggest mistake I did with my Instagram account was to link it to my Facebook. I believe it is impossible to unlink them, even having disconnected all external

Biggest mistake I did with my Instagram account was to link it to my Facebook. I believe it is impossible to unlink them, even having disconnected all external application access as far as I could go in both. Why? "Your friend Xxx is now on Instagram". Etc etc. I don't want to know, and I don't want my account visible to everyone there. Please just respect my wishes to make the integration go away!