Sorry if my answer wasn't what you were expecting; however, I usually stay within the Computer Science area...
Anyway...I was actually thinking of this the other day. I had one girlfriend my entire life, and the only time I was able to get one was when had a severe case of anorexia nervosa, it didn't last long...however that wasn't really the point. It's been about 8 years since then, and I'm almost into my 30s now. The point is, I started to think that whoever said beauty didn't matter, lied..and they honestly probably did; however, even if you can speak for the majority of the population that doesn't necessarily mean everyone. Ok, I admit it, I am ugly, it just doesn't bother me anymore.
After the 4th year being single again I had begun to wonder why I was still depressed and I had realized that I was trying to do what others told me to do (my guess is the average person doesn't think much) and try and find happiness in someone else, rather than though myself. I ended up working out a bit, starting college, and interacting with others; and I am still ugly but I have a life, because I chose to. Life is mainly about choice, probably the most powerful of which is a perspective; you can choose to feel sorry for yourself, or you can chose to do something about it. Either way the choice is completely, up to you; I chose NOT to waste my time though, and even though I STILL don't have a significant other after 8 long years, I never regretted anything I've done since I picked myself up off the ground.
To be quite honest though, if I was in your poison I would consider seeking professional help; you have a few signs of a few mental disorders, and that may be causing your depression. I took a look at the pictures you sent; if that actually is you, you don't appear to have any huge physical abnormalities (actually any at all), and really, you should probably consider going to a mall or something; you honestly don't look much different from people that appear to be around the same age group. Not to sound rude, but there are tons of people that are worse off in the looks department than you are; imagine if you lost all you're hair at 15, I know a person that has. If you do choose to seek help though, be careful what you say. I myself was forcefully drugged and restrained for about 12 hours because I was put on a 5150 and considered a risk to others . I'm sure others will disagree with me telling you the truth, but hey, least you actually know.
All in all, life isn't perfect; humans aren't perfect. Why you seem to feel you have to have someone special in your life I am not quite sure, but how you feel about it is your choice. As I stated before, I had somewhat of the same feeling a while back; I've left a link to a book that helped me out alot, and perhaps it can do the same for you. The book will explain a lot of theories to WHY you have the feelings you do, and believe me, you're not alone, you never have been.
Just to answer your question before my answer is reported for NOT answering the question, no, it isn't. If you believe it is logical for someone to kill themselves just because they THINK they are ugly...maybe you should start looking into where your priorities are; and perhaps go one step further and take a few courses related to logic (maybe something in mathematics, chemistry, or physics).