I'm EXACTLY the same way. The only thing I don't consistently change my mind about is my relationships (wife & kids). But work, religion, hobbies, it's like a rollercoaster.
I've been thinking, specifically in relation to work, that it might be best to work out the skeleton of my interests, which is to say the common elements. Then find jobs that operate the same way. For example, the most successful jobs I've had in the past have been those where I was left alone to get on with the job, and where I specialised in the station I worked, instead of constantly being moved around from one job to another. So I'm guessing that if I could identify a number of jobs that fit that pattern, then I'd waste less time looking for just any old thing, a lot of which I couldn't successfully do.
However, another value of mine is personal time. I hate the idea of losing most of my waking hours to work. Wake up to get ready for work, work all day, go home to shower, eat, wash dishes. Then enjoy the only two hours of personal time out of the last twenty-four. Five days per week in a job I hate.
Ahhh, but if I could do it just enough hours to get by, thus maximizing free time...
If only I could choose and STAY choosed. 
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assumption makes an 'ass' out of 'u' and 'mption'.