How to avoid coworkers who are too chatty or who go to work to make friends ?

Surely there's a happy medium between going out on the lash every day and shunning all forms of social contact, as you seem to want to do. A lot of work is about team work and that means establishing good relationships with your colleagues - and social events are a good way of getting to know people. It's not helpful to have a 'loner' in a team.