Huge muscly shoulders with under developed hindquarters is a classic sign of a horse that has been ridden constantly on the forehand.
You need to find a good trainer to help you - learning to ride a horse off the forehand is about developing a feel rather than reading the theory.
As far as theory goes, you do need to understand a little but about equine biomechanics. For the horse to come off the forehand, you MUST ride the hind legs rather than the head/neck, if you try to simply pull the head into a 'round' position, you will never succeed.
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