I'm not sure who these people are who are asking you to injure yourself. You are responsible for your own safety. If you are at risk of injury, STOP.
It sounds like you may have a repetitive stress injury. Pushing on through pain will very, very likely only make this problem worse. You said yourself that you know the difference between soreness and pain. Take care of yourself. If you cannot work because of your condition, then you need medical attention. If your injury occurred at work during the normal course of your duties, and if you were performing your job correctly, your doctor will necessarily be involved in filing paperwork for an on-job injury.
It is absolutely imperative that you report your injury immediately. If you do not report it right away, the company will will be able to argue that your injury didn't happen on the job. Without documentation of your on-job injury, you will be on your own to pay for medical care, and the company will not let you work.
Report your injury to your full-time supervisor or that supervisor's manager immediately. You need to see a doctor and may need time off to rest or a temporary alternate work assignment. If you do not report your injury right away, you won't be taken care of and may have to quit your job if you can't stand the increasing levels of pain.
Again, STOP. Advice to injure yourself for a $10/hr job is irresponsible. You won't get health benefits if you're too injured to work. Then how will you afford to get the medical care you need?