Many Southerners have different accents depending on who they're talking to (often divided between business and personal life). I moved out of the South years ago. My Southern accent will definitely surface whenever I'm talking to relatives or childhood friends or local friends who are also from the South. I tend to moderate my accent to match more closely the accent of whoever I'm talking to. I have done this ever since I was a child, and I don't always realize that I'm doing it. So don't sweat it. It's surprisingly common. Look on it as a skill, not a flaw. Acknowledge it and move on.

Agreed. This is actually a named phenomenon known as “code switching” and usually attributed to black people, people from other countries, etc. Many people do this subconsciously, speaking in a “proper” manner when in certain settings such as at work or with groups of friends, but delve into their more comfortable vernacular that they probably grew up using with other groups such as family and close friends. A LOT of people do this and don’t even realize it. It took me years to realize I don’t like talking on the phone in front of other people because I would subconsciously “switch it up” and it felt weird because my brain was like HOW DO I TALK NOW?! My ex used to make fun of me because of how I’d take on my mom’s accent whenever I was on the phone with her. And I take on a totally different slang when speaking with my sister. It’s weird but natural. Definitely nothing to worry about at all lol. Just acknowledge it and move on.