They have become my friends

These few days i have been working alone. To avoid traffic jam, i go into client's office at 7.45am but the department of my client is still not open. I have to work in the open area pantry for about half an hour. No one to talk to, no one to complain to... only have to ask client questions, call seniors for some guidance, listen to songs and mtg. Sometimes working half way, i start wondering how are the other 2 colleagues? They are also somewhere in the building, different department. 2 of them are car pooling, so are always in close touch. For twice in this week, they forgot about me when they go for lunch. Not until i called one of them, they ask me to meet them at the restaurant or food court. They are always talking about things that i dont know, things that happen when i was not around, jokes that i dont understand. They even came to a decision to quit this job together next year. Silently, without giving any signals, loneliness and insecurity has become my friends... How to get rid of them?