Without more information about your ancestry and where your ancestors came from, nobody can answer your questions. Sahel and Southern Sahara are massive areas and give us no detail on your ancestral makeup.
If you do not have a recent European ancestor then you likely simply carry the DNA of constituent ancestors also with partial European ancestry. For instance, if you had 2048 ancestors at a level of your tree then perhaps roughly 700 were of some European extraction, according to your test. Your brother or sister might show more Euro or less but that is the nature of DNA and these tests. Your mother could have had 300 and your father 1000 and you came out in between.
You could also have some ancestry that is recognized as European because it has only ever been found in Europe...