Literally if you gave me £50k and said here, you're 17 again, go to university and study absolutely anything you want... I wouldn't have a clue.
I'm 35 years old and I've had huge self esteem issues over the last few years. I think part of the problem is that at work I'm often surrounded by successful people who know what they want, are all better paid than me and are all qualified. Some of them started as juniors or still doing exams and they're now probably earning thousands more than I am moving into higher ranks. Whilst I'm still in the same role...
I'm a secretary and whilst it's not the worst job in the world it's not a career and I'm so bored with it. I've had two long term jobs, both in admin. I've done online questionnaires to find my ideal job and it pretty much said the one I do! There's nothing I'm really good at or really passionate about. I was asked in my appraisal what my goals were for 5 years time and I shrugged and said I just want to be happy. Be surrounded with family and friends etc. It's true, not everyone is hugely academic or ambitious and not everyone has a glittering career. I don't handle people or stress well anyway, but I still feel like a loser sometimes.
I don't think there's an answer really, I know if I'm fed up it's only me who can change it. I'm just envious of people who know what they want to do!