It is very smart to consider what you really want to do with your life before investing time, effort and money. Taking career aptitude tests can help identify strengths and interests to put you on the right path. Following are a few good sites to consider -

http://www.livecareer.com/default.asp?lp=st03&cobrand=CLEAR
http://www.career-tests-guide.com/career-aptitude-tests.html
http://jobsearch.about.com/od/careertests/a/careertests.htm?r=9I
http://mycareercalculator.com/?SSAID=7
http://www.worldwidelearn.com/career-assessment/career-assessment-test.htm
http://www.ehow.com/facts_4840023_career-aptitude-tests.html?ref=fuel&utm_source=yahoo&utm_medium=ssp&utm_campaign=yssp_art

Explore your interests and go for it. Life is too short to settle on something you are not interested in doing.
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if you like to investigate and research things, there are options besides police officer and FBI agent.

investigative reporter
internet security
research scientist
court reporter ........ etc.
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