What you will find is that you need some good distance to keep yourself in the frame. Even at some distance, less then 30' will not yield good results. The area of the image would still be too small (and it would still be better to increase the height rather then the distance). Also, unless you are in an open field you will want to be higher than 34' anyway. I'd venture to say 50' should be a minimum.
Follow me mode is _not_ like a selfie video. The drone does not fly right next to you. While DJI has done a _great_ job with this mode, it still not very practical.