What are nnaemeka's objections to the girl his father finds for him to marry? in "marriage is a private affair" by chinua achebe

The answer is she is from a different tribe. Nnaemeka's choice to get married to Nene although his father would renounce him is the internal conflict for the reason that even though he knows everybody will give him different and push apart him and Nene for breaking the customs, he still becomes married.