"Saya tidak Tini."
work instead of:
"Saya bukan Tini."?
Bukan - Is used when negating from nouns and adverbs.
Tidak - Is used when negating verbs and adjectives.
Terima Kasih! <3
Why Aku instead of Saya?
My Indonesian friend says one is more formal than the other, but it doesn't matter much.