I’m glad to see that you are interested in the Catholic faith! “Catholic” means “universal” and the Church was referred to as the Catholic Church (ekklesia katholika in Greek) from the very beginning to stress that salvation through Christ is universal - that is, it is not restricted to any nation of people.
The Catholic Church thus has a presence throughout the world and today there are many Catholic Christians of African and Caribbean descent. I’m a Catholic of Jamaican and Italian descent and both of my parents were baptized in the Catholic Church. At the church I attend here in Toronto, Canada, there are African (Ghanian) and Caribbean groups. The pastors of my church are connected to the Consolata Missionary Order, which has a presence in Kenya. Keep in mind also that many Latin Americans are of mixed African descent, and Latin America has many Catholics (as does Brazil, which has the largest population of blacks of any non-African country).
Here is an article that will assist you in exploring the Catholic faith: ewtn.com/faith/teachings/churmenu.htm
Your decision to become a Catholic Christian should be based on whether you accept that the Catholic Church is truly the one Church that Jesus established 2000 years ago, and not on the ethnic make-up of the Catholic churches in your neigbourhood. I hope that reading the above article will bring you to the truth.