I too speak three(four) language at absolute native level and three (two) at conversational level. And one at a beginner level.

Some of these a polysynthetic languages, others are agglutinative. Two are tonal, and one doesn't have an alphabet.

No here is the thing: none of this has affected my identify at all, not even in the slightest. Same person: just different sounds for things.

Presumably my testimony counts as well.