I need your help.

I have really bad posture. I’ve been hearing about it for years from my mother and now I hear about it from G (my second mother). As soon as someone points it out, I shoot up really straight. I’m super careful for about 15 minutes and then slowly move back into my slump. I know how bad it looks, I’ve seen it in the mirror, but I can’t seem to get it through my head to stay straight. It’s baaaaad.

What’s a girl to do? Walk around with a book on my head at all times? Get a shock collar? Do you have any tips for improving posture?