Just can't get a girlfriend

I don't understand what is wrong with me. For some reason, I just can't find any girl anywhere that I feel comfortable going up and talking to. I'm actually terrified to talk to any girls. I've only met a few girls in my life And I mean about one or two girls that I wasn't afraid to go up to and talk to. I am afraid any girl will think I'm the most ugliest, disgusting looking person on the earth. Is this normal?