As a child, I didn’t really have a lot of friends. The ones I did have, however, were pretty loyal, and they all have one thing in common; they moved in from out of town, and for whatever reason, I attracted them into my circle. I always thought of not being able to associate with an existing pool of peers as a weakness, but now I see my ability to attract outsiders as a unique social power that overcomes this detriment.
In nature, evolution favors diversity, since that is the greatest insurance against an extinction event. Certain genetic attributes will continue to move forward through generations as other ones fall out of favor. If there are so many people who think alike when some major threat is introduced to humanity, would if the largest, most homogenous group is at the greatest vulnerability? Which group will survive? If people with a variety of tools to combat this threat come together, the chances are great that not only they can survive, but they can help others improve their chances as well. If you don’t have a wide group of friends, what is your insurance policy?
On a less dire note, if you desire to grow and learn as a person, is it not better to have a diverse pool of humanity to connect with? If you want learn new skills, discover new passions, and bounce ideas of each other? Sure, the same thing day in and day out is comfortable, but what’s the fun in that?