I couldn't agree more.
Even when I was at Uni (squillions of years ago), there was a real sense of being on a conveyor belt for the legal profession. Trying to get some lame work experience in first year holidays, applying for vac schemes early in your second year, then training contract applications, dashing off to law school and then (if you were lucky) starting a training contract in London. At no point did you really feel you had an opportunity to pause, take stock and make an active decision. That was particularly the case coming (as many of you might) from a family where I was the first to go to Uni and we had little understanding of what options were out there.
The irony of this is that many applications and interviews ask (i) why do you want to be a lawyer, (ii) why do you want to work in "City Law" and (iii) why do you want to work for us? When you're 20, not long out of school, these are ridiculously difficult questions and answers inevitably seem naive. Far better, perhaps, to build some life experience and make a proactive decision to join the profession when you can justify and evidence that decision.
I would also echo Stiffy's point about trying to work out what YOU want to do. If you mull over this and use phrases such as "I should do X" then you may be looking down the wrong path. Are you feeling pressured by external factors (friends, family, society) to pursue a particular route? Is it just the "done thing" to follow this path? Or can you actually use the phrase "I want to do X"?