Were you born with a stutter? Or did it develop later?

Were you born with a stutter? Or did it develop later? I started stuttering around 12 and I have no idea why. I actually remember a time in third grade my friend started going around saying this really fast: “do you lick a dick a day?” Lol but he said it fast to confuse people and some kids would just be like “yeah”. It was funny. I tried speaking fast like he did. I had some trouble. I wasnt stuttering but i had to say it slow...almost felt like a very minor block. The earliest i remember stuttering was in 5th grade.