I've noticed that it's hard for me to join a group of people that has more than 2-3 people. Thinking back, throughout my entire life, I've always been in groups of 'only' 2-3, or 5 people tops. I tried doing the whole 'going out of your comfort zone' and getting into groups which had 9-10 people but the vibes they gave were exactly like you said - superficial. You had this constant feeling that the other people weren't above backstabbing/trampling you over to achieve their means. It felt kind of hollow, and I slowly started to drift away from them to meet others.