@seVen It makes no odds whether you carry a donor card or not. The team of doctors that care for you will be a completely different team to any that are involved in organ harvest or transplant. Also you should rememeber that when anyone dies the relatives can be apoached and asked about donation regardless of any donor card you carry. In the UK a donor card only represents a general desire of the individual to donate their organs not a legally binding contract the wishes of relatives are alway taken into account.
Secondly organs are distruibuted on a combination of need, waiting list and suitability. For example you may be at the very top of the waiting list but if the next organ that comes available is physically too big for your body then you won’t get it.
Thirdly I would strongly urge you to consider donating. An organ donation can (and does) change a person’s life. Not only does it allow them too a live longer an more active and fulfilling life but also touches them deeply in a spirtual sence. Also, you never know when you are going to need a transplant your self so it’s always a good idea to ensure the available pool is as large as possible.
While we’re at it you should sign up to become a bone marrow donor. Donation (when required) is no more complicated than giving blood and can save the life of someone with leukaemia where no other treatment would.