Why don't I have any desire for a relationship nor really interaction with a girl??

I'm a guy, 21 years old, and I find it interested that I don't have a desire for a girlfriend nor really interaction with a girl... never have... I've never kissed a girl either... 21 years old and I've never kissed a girl, now I know for a fact I'm not gay, but idk its weird, recently I had the opportunity I had the chance to have a girlfriend but I completely blew it off as even when I could have kissed her there was no desire to... I have friends constantly trying to hook me with girls and such but just... it doesn't sound appealing... Hell I have a hard time just giving them a hug... and its not that I find women to be disgusting either... but idk, should I actually be worried about this or be grateful? I mean because of this, I see my friends all the time going through break ups and such and it looks really painful... but I don't have to worry about feeling that pain... But at times i do feel lonely as all my friends are off with their girlfriends and such and I have no one... but yeah...