It really isn't safe to try to stop by dragging your feet. It isn't going to help in an emergency and probably would just result in an injury to your foot. Sticking your foot out when you turn is especially unsafe. If there isn't a skills class where you are (I know most places where I go there isn't any classes like that) then maybe start by first going for slow and easy rides where you practice not putting your feet down until you stop. Get up a little speed, coast a bit, brake lightly to stop. Then put your feet on the ground. Try that for a while. Until you are comfortable braking. Then raise your seat just a little. And then a little more, gradually working your way up to where you should be. You might need some help getting the seat height right.
Trek Madone 4.7 WSD
Cannondale Quick4
1969 Schwinn Collegiate, original owner
Terry Classic
Richard Feynman: “The first principle is that you must not fool yourself and you are the easiest person to fool.”