Is it normal if i'm jealous of my happy friends?

So I'll start this off right: I am an ugly guy, and I've been told I'm not very exciting to most people. This hasn't stopped me from accumulating many friends however, all of whom I love dearly. My problem is that I get really bad flashes of jealousy when I see them in happy relationships, normally with other friends of mine. I have wanted to be in a relationship of my own for years, and it's all I can think about sometimes, and when I see my friends smiling and hugging and kissing someone all the time, my brain starts to boil with envy. I'm very happy that they all managed to find some kind of passionate love already, but I can't help but feeling insanely jealous and angry when I can't have what they do.

Does anyone else feel this way?