There are often problems such as these when working amongst other people, particularly in workplaces such as an office.
If you are being bullied by your colleagues, then you should certainly talk to your boss. You shouldn't let these people drive you out of work because of their behaviour towards you.
Try talking to any colleagues that you don't know as well and get friendly with them. Even though you love your job, it can be very unpleasant to go to work every day where people are hostile towards you, so if you make other friends then perhaps it won't seem as bad.
If you work a department store, then perhaps you could request for either you or your colleagues to be moved to a separate department. That way, you'll be working with other people who may be friendlier towards you and you won't be in contact with your old colleagues as often.
If you work where there are flexible hours available, then arrange it so that you work at different times to the people who you don't get on with.
I left working for a retail store because of the tension that was building up between myself and other work colleagues. I did get on very well with some of them, but there were rumours and a lot of talking behind backs going on, which made things more difficult to work out. The thing is that I didn't talk to the boss about it, and basically just said to the boss I need a break. I am considering going back, but having unsolved issues makes it even harder to go back. I would suggest working things out, or at least understand what the issue is, and you really need to bring this to the attention of the boss, because it is their responsibility to make sure problems like this are solved. Unless you think it is best to resolve it personally, but that often depends on the person you are dealing with. It is difficult to find jobs that you like, so you should not give it up so easily like I did without doing all you can first.