Joseph, you are going to get back on your feet before long so don't make any such decisions for a good while. Millions of people ride bikes and motorbikes everyday and enjoy it safely. You said that the insurance company said it was the other guy's fault so you didn't cause the accident. If you love that motorbike and love working on it, don't let any of this stop that in your life! Same with bicycle riding. I got in an accident in a four wheeled vehicle too- so life is full of dangers and what ifs.
I know that flashing back on the accident and just having to be inactive and endure what you are really can be anxiety producing. I had to use EFT on these flashbacks and super-anxiety after my accident- I can be pretty high-strung about things. The EFT really helped a lot to calm me down and help me think more rationally.
So my advice is don't let this stop you from having and doing what you like! Life is too short and any of us could be done with it tomorrow.