I was (and technically still am) a chartered accountant for over a decade. It was never something I wanted to do, but out of university I couldn't really think of anything else, the money was good and I always found it quite easy. I sat all the exams, played the big company corporate game for a long time and at first, thought I might even be able to enjoy it. It was easy when I was sitting exams, I just had to pass them and I would be rewarded straight away with a pay rise, job title change, more responsibilities etc, it was all very clear what I needed to do.
After I finished my exams I found the game changed quite a bit. Suddenly there wasn't a clear way to identify yourself as better than other employees - it was easy before, complete your work quicker, more accurately and get better exam results, bingo. Now I had to start playing office politics.
This, I found, I did not like so much.
Suddenly everyone was staying longer and longer hours - not to actually do anything, but just to be seen to be there, at all times. People were inventing wholly unnecessary projects for themselves so they had something to present at team meetings, time and resources were being wasted on ideas that were little more than ego boosters for those involved. I found the whole deal laughable, but then couldn't believe it when these people started to get promotions based on what they were doing. I lost a lot of respect for people who I had previously got on with very well, but worse still for people above me who were sucked in by this bullshit. I knew I only had two choices - I could either play the game and sit at my desk for ten hours a day on facebook to get the promotions or I could get the fuck out while I still had time. Sure there were probably some sour grapes at being overlooked, but the writing was on the wall even before then.
I don't really know whether I made the right decision and I can't really say I actually have any advice for you either - all I can say is that I don't regret getting out one bit, and that doing something you're not sure about for 8-10 hours a day for the next 30 years seems like insanity to me. It wasn't for me.
I'm a car salesman now - I've always loved cars, and I've always been good with numbers and people, and now it's something I can combine the three in so I love every day that I'm doing it. The bigger beauty is I can pick my own hours - I go to auctions when I want, pick up the cars I fancy selling and think will make me a profit, stand around eating bacon sandwiches with dodgy geezers who are a lot more fun than anyone I've ever met in accountancy and generally have a fucking ball. Everything I earn now I earn off my own back - if it goes well I did that and I reward myself, if it goes badly I have no one else to blame and I try and learn from it. I just couldn't be happier on a day to day basis.
As for the money, I've taken a massive pay cut, there's no getting round that, and I took some flak from family and friends at first for ditching a lucrative career. I chased the cash for a long time though, and decided in the end that as cliched as it sounds, there really is more to life than money.
And, fuck it, if everything goes horribly wrong I can always go back to accountancy, you have to remind yourself that even if you were out for a couple of years there's not much happens in most vocations that you wouldn't be able to get yourself back up to speed with in a couple of months at most.
Edit - Tl;dr