Your motorcycle mirrors aren't always equipped to show anything else besides those broad shoulders of you. You can't blame the manufacturer for not taking your impressive physique into account, but still; it's not entirely safe.
You could opt for a bike that's more suited for your type of body, but a couple of mirror extenders will go a long way too. They allow you to move the mirrors a few centimetres outwards, without the intervention being too drastic. You should notice an immediate difference.
The result you are looking for is a clear, distinct and complete view of what is behind. Motorcycling is to a very large extent a matter of looking (and thinking) ahead, but still.