Right or Wrong?

I have a question to ask and I have already made my decision but I was wondering what some other thoughts were.  My boyfriends sister is in desperate need of a kidney and no one in her family can give her one and she asked me if I would mind being tested to see if I would be compatible with her and I told her no I didn't mind and I am in the second stages of testing and so far things are going fine, no snags as of yet, and I hope that there are not any, the point is to try to keep her from going on dialysis, and she has been on the transplant list for five years and is number 23, but she doesn't think that one will come soon enough. 

I am an organ donor on my driver's license and I have done alot of research to see how it will affect me later in life, which the only thing it could possibly do is give me hypertension sometime in my lifetime, that won't be a surprise, I thought I would have it before now. My other kidney will grow to support the one one I donate and I will go on and lead my life like I do now.  They don't even put restrictions on when I can have sex after surgery, so it must not be all that bad.

I do have people questioning me though and I really don't know why..I mean the surgery itself is no different than having your appendix or gallbladder removed and I have had both taken out already several years ago, and no I'm not old, just in case you were wondering.  If you had the opportunity to save someones life or prolong and give them a better quality of life, would you do it?  My boyfriend thinks that I am doing it for him..he didn't ask me to do it, she did, so that was a no answer, but very self-centered on his part, and I told him that. 

Do you know that there are 80,000 people on the transplant list for a kidney and that is more than heart, liver and all the smaller ones combined.  Imagine if that many people who are healthly would give up one of their kidneys how many lives would be saved every year, because I think it is like 1500 that die every year waiting.  Would you want to be on that list?  I wouldn't and that is why I am doing this, so I can make the list one less person and she does not have any antibodies, so she wont reject it, for now anyway.  They made it sound like it would be a slow process, but since my bloodwork came back good, the lab work and the test are just piling on full throttle.  I work 40 hours a week, go to school full-time(13 hours) and Im trying to get testing done to do this and keep up with homework, funny thing about all this is that I am the type of person who gets very stressed out at the drop of a hat and I have no worries at all.  I am not a very religious person, though I do believe that everyting happens for a reason and I hope that I get through all the labs and tests without any problems so I can help her.

Anyway I guess I really don't have much more to say I just wondered what others think about it.  Some of my co-workers are behind me and some no so much, but they worry about me, they think that I take on too much and don't worry enough about myself, but if I did  not do this and found out that I could have helped her and she didn't get a kidney, I think I would feel horrible about myself for being selfish.  Would you?