You mentioned that Nigeria is a Federal Republic, as such i'd like to think of the governance system as being a democratic kind just like mine. I personally have never cast a vote since our presidential elections take places every 7 years and to be eligible, you must be at least 18years. I qualified for the most recent electoral process in 2018, however there was massive insecurity in my region, as such i stayed indoors as expected. I am glad to hear that you weren't hurt during your experience. African countries are faced with electoral crimes each passing election proceeding. We can only hope for the best my friend.