I completely understand where you are coming from. I have the same feeling, I try to remind myself to just relax. You need to talk to someone or somehow fill yourself with confidence. Positive thinking can do wonders! Try to not put any expectations on getting pregnant as of right now, like don't expect to be pregnant your first time out or by a certain time. That would be putting too much stress on yourself and will only increase your desperation. I know this is easier said than done (all too well) but try to remind yourself to relax and not to obsess.
I hope you do get pregnant quickly and can start picking up the pieces and moving on.