You’re still young, that means 1) you will heal well and 2) you don’t yet understand the value of friends. Let them back into your life, having a positive outlook (which friends will help provide) will only benefit the healing process.

I’m a biker and have been all my life – sadly this is part of the risk you take when you hop on two wheels, I’ve lost a few good friends over the years – all but one was the fault of a dozy not looking cager. You will get your life back together, but only if you will it that way, there’s no point burning valuable energy wishing it didn’t happen – it did – look to the future and spend your energy divining a new path. Good luck.

I hope Steve is right, although it does depend on what your injuries actually are - for example, will you be able to work again as a dentist?

I think you should get counselling, as it's quite understandable that you should feel like this if you don't see how to get your life back. But people do fight back, and lead highly fulfilling lives: I'm sure you can read about many examples of people who like you initially despaired but then found something they courld do which is really worthwhile.

I'm sorry to hear of your accident and wish you the best possible recovery.