Inability to Speak Native Tongue Fluently?

I have an American flag when I was born in Korea (but I'm an American citizen from birth).

I use to be extremely fluent in Korean along with English, but because my family moved to America, both my parents felt it'd be better if I stuck with English since it would be the language I would be speaking most often. My Mom started to learn English, so rather than talk to me in Korean, she'd talk to me in English. After years of that, well, no more Korean (well, little to none).


Though, I do see a lot of individuals who moved to America from another country speaking their native language; however, after taking American classes and being fluent in English they start thinking in English. Although they speak in their native language to their parents, they tend to mix in English words.

How ya doing, buddy?