Hi Rach,
Sorry to hear you're having a hard time in your job. I would say screw what they say about you 'not being able to handle it'- if these people are as mean as you say they are then their opinion is worth nothing!
I've been in jobs I hate, I used to cry outside before going in to one of my jobs cos I was bullied by a colleague. I am now in a job that I am happy in and it makes a HUGE difference to my personality. I really think you need to get out of there as soon as possible, for your sanity.
Good luck
