Has anyone really gone through life without falling back on any plan b's, c's, d's or f's? I don't think so. there will always be something that pulls us away from our life's dream plan.
You may not be living the dream you thought you were meant for. But through failure and disappointment opens new passage ways to find hidden talents, passions, and a paved road to a new beginning. Which as Henry Ward Beecher said, "Ones best success come after their greatest disappointment".
It may be hard to face the facts that you lost chances, but you've gained new opportunity.
don't be scared of new opportunity. don't fret over new possible disappointments. they are bound to happen. Robert Kiyosaki said, "The size of your success is measured by the strength of your desire; the size of your dream; and how you handle disappointment along the way." you might be disappointed if you fail. but you are seriously doomed if you don't go out and try.