How long has it been since they've contacted you? It may be that they're simply too busy to keep up a pen-pal relationship for the moment. Pen-pals aren't magic talk-boxes that respond whenever you want them to....they probably have busy lives that they're juggling while they try to keep in touch with you. They may also have other pen-pals themselves, which can add to the complications.
Don't take silence from a pen-pal is a token of their lack of care for you...there is probably more than meets the eye here. At any rate, everyone on THIS site is very nice and I'm sure we're all willing to talk to you or recieved PMs if you ever want to chat or are feeling lonely. So use us! ^_^
----Steve