I think you should tell these co workers to mind their own business and to keep their nose out of yours. Let them know your there to work and nothing else.
I am sure that they have their own problems and secrets. I doubt they would like it if the entire team were bothering them about it.
Ok so you dont work with your manager but you can ring them and book an appiontment to speak with them.
They have a duty of care of their employees and if you inform them that there is bullying in the work place then i think they have to act upon it.
Even if you changed your job there is no garentee that you wont meet horrible people there either.
You should not have to deal with this at work.
Do you have a supportive family or friends outside of work? Or a therapist?