Hi Hopeful
You sound devastated, I'm sorry. However, I also don't have real answers to your questions. After 24 months of being off the pill, I'm also still not pregnant, so I don't really know how to comfort you.
You ask "how does everyone do it and stay positive" - the answer - what other choice does one have to just do it and carry on? And we really don't stay positive each and every month, that will never happen. But sometimes you find new energy and continue again.
Good luck and you are not alone, there are a lot of ladies just on this forum that have been struggling for a very long time and there are wonderful positive success stories as well!