I hear ya. I have had many 'careers' that lasted for just one or two weeks, at least one that lasted till my first coffee break and my shortest career was around an hour. Yeah I think becoming resilient to change, promotes a greater optimism and optimism is definitely a learned skill rather than a default setting for most.
I'm sure the big adventure of life will have twists and turns but I am certain your path will be fruitful and fulfilling.😃