Why be bothered over such things? From the way you described it,
probably sounds like due to peer pressure, which is, you see people
have you feel complied to do so too. I'm quite sure you are more
superior in some ways than those with girlfriends, like, a fatter
wallet, more time spent with your family, no need to answer to
anyone, free to do anything etc.......
Take myself for example, so what if i am funnier, richer, better
looking and more well built than my friends? If i don't make myself
to go for it, i have no one to blame but myself, so get moving!
That is, if that's really the priority in your life right now.