Your sentence is ok. Below is the best way I can make sense of your sentence because you have not explained your intention or context with the sentence. Rearranging the sentence makes it read better. I overwhelmed you with tedious things because I didn't ask you which language you're focused on.

To make this sentence sound more pleasant you could emphasize your concern for them. "I didn't want to overwhelm you with tedious questions about your language studies." This arrangement shows your interest in saving them from answering tiresome questions. Hope this helps

The sentence seems fine to me, I don't think there's too many occurrences of the word "you". But if you really want to, you can try swapping the cause and effect around: I overwhelmed you with tedious thing by not asking which language you're focused on.