How do you know that you want to be a lawyer and why? -

its necessary to put a check and blance on the mind of ppl

if you want to get a good paying job by screwing other people up, then go ahead be a lawyer. sorry to bust your bubble but thats the reality, you dont always choose what cases you get, and 50% of the time your fighting for the bad guys. if you can accept that, then be a lawyer.