Ed don't give up yet, you are super young, you will get there but sadly you can't see it yet. We have all been there trust me. Fate will sort you out in 5 minutes. Don't forget Air Ambulances are going 2 crew for all that night flying.
Keep applying for everything and anything you think you would like to do, sometimes you have to use certain jobs as stepping stones.
I used offshore as a stepping stone to get the holly (sp) grail of the industry but it did take me 6-13 years.
What about Tuna spotting?
Anyway chin up.