Not sure if this would be of any help to you, but I fractured my left femur, left toes, right knee, right tibia, right ankle, right heel, right clavicle, left ribs, and other internal damage. I was involved in an RTA 3 years 8 months ago. I was 44 years of age when the accident happened. I know what you must be going through but you will get your mobility back. It all depends on you and how much you are willing to push and most of all to know when not to over do it. The muscles need a lot of work and a lot of rest, so find a fine balance. It will take time, so don't be impatient. You are very young and you will get back to were you were before the accident. I now walk six miles every day, strength train regularly, and jog on the treadmill. I used to be a marathon runner before the accident.
Don't give up!