Playing alone? No friends? (lol) Do whatever you want. As a single you have no "standing" on the golf course so you should not go back ad re-hit if it will delay the group behind. I don't think you should post scores shot when playing alone; you can't really claim a hole in one without a witness either so I say it does not matter. I would drop a ball where I thought the ball should have been and use the round as practice to see what I need to work on most.