After joining a research group, I discovered my colleagues are always lowly motivated. They play card games and online games, and they listen to songs with the loudspeakers on all the time. They never discuss research-related things, and the only time they open a spreadsheet is to calculate some kinds of points in online games. This all happens in office hours in the laboratory.
I expected my colleagues would be happy to discuss with me about research problems, but it turns out nobody is willing to do this except my supervisor and some of the post-docs. They just focus on their entertainment. I do not know why they want to do a PhD; maybe they just want to delay their entry into the job market. However I really want to be trained as a good researcher and I am serious about my PhD. I cannot stay motivated all the time because their attitudes seem to gradually be affecting me, and the atmosphere is simply full of laziness. I can notice myself sometimes lowering my standard in research work now.
My supervisor seems ok with it and does not get angry at their slow and boring progress. My research interest matches quite well with my supervisor's, and I do not want to change my supervisor just because of those lowly motivated students. How can I still be motivated in a lowly motivated environment?