I think at the time of the Falklands, Maggie used to ask her ministers if they were 'getting the wobbles'. It's not surprising if you are- you are taking a big step. Well fortune favours the brave! The job market is good. A good supply is needed. You're placing yourself in position to be there. Guys like me can't go on forever (even though I'm doing my best). All along in BA guys like you were joining, and now I fly with people who have made career changes- one from being an ex-BA executive to an independant pilot.
I cannot recall one I have met who regretted it. Hang in there. If it's your calling, you'll know. You can only do your best. Then when you've got there, you can be a Pprune regular like me, and bitch all the time!