Hi Cojean,
You might want to check out the Transplant Support Forums at http://www.transplantbuddies.org/
There are tons of different perspectives of people that have had lung transplants...even people that have had TWO lung transplants, because life is so much worth living regardless of how difficult the actual procedure is.
Before you take your Mom's advice, I would contact a transplant center and at least become educated on transplant. I am not sure where you live, but Loyola in Chicago (and I'm sure other centers) offer education classes to teach you and your family all about transplant - the risks AND benefits - so you can make an educated decision. I think Mag has a great idea about asking your social worker to put you in touch with real transplant patients.
It's true that the survival rate is 50% 5 years post-transplant, however, if I can have 5 years of being able to ski, bike, hike, travel, play with my dogs and look forward to doing things with my husband and being able to breathe - I'm gonna TAKE IT! You never know, you could be part of the 50% that lives beyond 5 years out to 20+ (Yes, I know some people 20 years out!!).
Let me tell you this - I had a lobectomy in 2009 and during the recovery period of the surgery, I was in a fair amount of pain and very uncomfortable...however, when I think back to what I went through, I honestly cannot really remember the pain. I just feel proud of myself! You can do anything you set your mind to if you are informed, your own advocate and thinking of the future goal - and suddenly the fear will start to fall away and you will see hope!