Pain is only temporary, the feeling will go away and strength will take it's place. Living with pain can be very difficult, but once you find a way to get through that pain, it makes you into a different person. Going through difficult times wears you down. There is no sugar coating it, it just plain and simple sucks, but it's the end result that is worth it.
Having to go through painful times is not what most people think of as a fun time, but you need to try and think of the good that can come of it. I know it is a lot easier said than done, but I have some examples.
Sometimes the pain you feel can be emotional pain that can come from loss then there is actual physical pain or something completely opposite. Pain comes from everywhere, and no one can tell you that you aren't feeling pain. As Hazel Grace from The Fault In Our Stars so blatantly put, "Pain demands to be felt." In my own experience, I have lost people very close to me, I have had to go through different struggles that life has thrown at me and there is absolutely nothing that I can do about it.
Friends will come and go in your life, but those friends that do stick around are the ones that will help you through those tough times. Sometimes family members will leave you, not by their own choice, or maybe it is, but when you survive that particular loss, you will realize it made you stronger.
I would say with time you will learn how to grieve, whether you loose 1 person or 10 people in your life, you will never learn. People show grief in many different ways, they try and fight it, but if you fight it, grief fights back harder. You might not understand it or want it in your life, but without grief you cannot move forward with your life. You will be stuck in the exact same spot, not being able to have wiggle room even. It is a scary thought, but you need to over power it.
There is also physical pain that exists. Everyone has felt it, whether it's the severity of a fatal car accident or a simple paper cut. Physical pain of course hurts a lot and sometimes you can help it and sometimes you can't. The good thing about physical pain is most of the time there is a medical solution. This type of pain, most people would prefer over emotional pain, I know that if this pain didn't last that long, I would rather it over emotional pain everyday.
Physical may damage your physical being, but emotional pain goes far beneath the service. The trick is, you need to know how to beat it. Know how to defend yourself against your inner demons. It's hard to do, but once you face your tragedies, there will always be a light at the end of the tunnel. You just have to get through the darkness.