What makes a social error wrong isn't the social error itself, it's the fact that you're not aware of it. To correct it, you simply need to tell her what you just did. This will instantly make it ok, will also show a meta awareness from your part. For example,

 

Talking to her from behind like a creep "I feel like a creep talking to you from behind, turn around".

 

Waiting for her outside the bathroom after she said she had to go to the bathroom "Here I am, lurking outside the bathroom like a creep"

 

You don't know what to say "I don't know what to say"

 

...

 

I recommend you to keep going with the conversation after it, otherwise you'll just be there "What do you think of that?!", but the interaction is yours, you do what you want.

 

Have a good one.