Hello trieuminh,
I started teaching my child English since he was born with singing and playing nursery rhymes and lullabies to him. Later I introduced him to flash cards and LR. Now he is 2,5 y.o. and at home I speak only English to him. I perfectly understand your concerns

And I agree with the opinion voiced above - do not underestimate your child. Believe in your child. And try to xpose her to the English language and culture as much as possible - speak English to her, show flashcards, watch cartoons, play audios.
You can also split the roles in your family - for ex. you'll speak only English to your child, and another member of your family (or all others) - your native language. Or choose certain days when you all will speak only English.