Who needs girlfriends or boyfriends!? I really hope I never have one!! And I'm not just saying that I really really really mean it!!!

There is such a thing as "sex" in the world primarily for that. Sexually-reproducing organisms will have a certain chemical alignment to each other and mate, produce offspring, and if they are sociable creatures they do this to structure and intensify clan/pack activity.
This is especially important in humans, a specimen notable for its high intelligence quotient. Humans are able to form massive societies so romance and mating is extremely relevant to form powerful families and societies.
If organisms of the opposite sex did not mate, then sex does not mean anything. I always wondered why gender existed at all, when other, less complicated species could reproduce of their own accord - mitotic division, for instance. The answer of course, is genetic diversity.
Organisms that mate with slightly different organisms are the reason for evolution. The genes of many a human race, for instance, have combined with the process of mating and thus have produced different cultures and ethnicity around the world.
Thus, it is only important to have strong romantic and sexual urges in order to not only continue the race of a specimen, but to help progress the complexity of Earth's creatures. How do you think there ever will be humans if different apes did not co-exist and mate with each other? There is a reason for this concept, not just to make life a fancy.
I hope this applies to a 13-year old female like you. Good luck.
