Socializing=Laziness

Am I the only one who feels lonely in a huge group of people especially if you know everyone in that group. Like you wish you would rather be anywhere else. I feel like I get along more with strangers than the people I went to school or college with. I can keep up a conversation with a stranger but a friend I've known for a long time it's hard to even reply to their messages or pick up their call. I do agree that it depends on who this friend is, the history of the friendship like the whole background. Personally, I can say that I speak comfortably to only 7 people in my entire life including my family. Is that enough at the age of 26. Isn't this the age where you should be connecting and socializing? Is the goal only to meet new people and not maintain any former friendships that have worn out? Is it okay to just give up on relationships and not give a fuck?