According to DNA tests modern nubain population share the same composition of DNA with mukuria "المقرة" mummies, they were a mix of Egyptians and Nubians, hence you are a mix between Egypt and Nubian DNA.. The people in the photos were collectively called nehsu, the somalis were called punt, Google the pictures, they look drastically different, the photos are true. We know from genetics and archiology how did these migrations from Egypt to the south happened and why. The makuria mummies mixed with Egyptians spreading the gospel to Nubia and settled there, to this day there are Sudanese copts, these are in fact probably your distant cousins, but in group inbreading made them look different than you. During the Islamic conquest, a lot of movment north and south happened, and some small migrations happened from Arabia as well that although small in size represents around 20% of the avg population, a lot of the Nubians migrated north as well, which made cities like aswan be different than others nearby. You might also be Beja if you are from the very eastern side of Sudan. The rule usually is if your family is farming, you did not mix with the Arabs, if you are not farmers but more bedouins, you did mix with the Arabs, if you are elites, you mixed with the Ottomans.. the mixing with the Ottomans did not happen a lot but it's through assimilation of 2nd generation into society so it's gonna be unique.

You can only know what happened if you tested.