I sometimes catch myself doing this with children (name) needs to go to the bathroom, I will be right back. As I think of it now it is kinda condescending, like talking down to them...not judging anyone else, just myself. Anyway, that is the only time I do it... but I do think if it bothers you just practice saying I and eventually it will become second nature. My autistic niece does the third person a lot and sometimes I worry I am modeling wrong for her so trying to say I more myself...