Are there specific 'heritage' markers I should learn to avoid sounding like a textbook?

I grew up hearing Igbo in my home, but I never spoke it. Now that I’m trying to learn, I feel like my pronunciation is 'too clean' or formal, and it doesn't match the flow of my family members. I want to sound more natural and less like a computer learning the language. Are there common regional variations in the Southeast that I should watch out for so I don't sound like I'm just reading from a standardized grammar manual?