Why is finding a girlfriend so difficult?

A long time ago when I was just a little kid in 4th grade, I was being pushed around by the annoying bully all the time. He said that I was evil because I didn't have a childhood sweetheart. The truth is that I was just a little kid and at that time I had no interest in girls like he did. I was only interested in thing that little kids were interested in, such as toys, games and TV. A year and half later, I entered 6th grade and this is when the weird feelings began. Not just that, but that bully came back and pestered me again. He told me that I would never find a girlfriend, but I told him that he was really full of it. One day, we got into a fight and I got a black eye out of it. There were girls in the crowd watching and I felt somewhat embarred when I had to fight like that. Most of the students there thought I fought for popularity and the bully thought that I fought to impress some girl. All I really did was fight to defend myself. If I didn't do that, I never would have survived. Now it's ten years later and my feeling have changed and my interests have changed. I do want to meet a girl one day that I can have a relationship with, but it is kind of difficult. Every day I expect a girl to notice me, but they just seem to walk by me as though I don't exist. That really hurts me inside because I still have nightmares about what the bully said to me. I sometimes think what he said took effect, but I highly doubt it. I'm just curious about why they never notice me. I dress nice, comb my hair and god out to look my best. But every day, I pray that I meet someone that could help me end this pain I've been feeling for the longest time. How do I meet that special someone. How do I act and what do I do to gain her interest? I just simply want to meet someone. Not to prove the bully wrong, but to make myself feel better. I also want her to feel good about me too. Why is it difficult these days? Why are the prettiest girls so difficult to find?