Depends on your style of talking. I know plenty of cops that are shy and of the anti-social type, but they are very firm and aggressive. There isn't much talking in Law Enforcement. You investigate by hearing what people say, then make a decision based on the details and evidence available, if any. You just have to be very physicaly fit, aggressive, have extremely good memory, be punctual and have a great deal of self-discipline and be time-oriented.
Data Entry or general office work doesn't require much. Zoology is another one. Usually those rare fields where there is a lot of outdoor work. Stay away from retail, education, and human resources or social work.