You may think that having a shy and introverted demeanor in the workplace is holding you back. Add to that a weak aptitude for math, and it may seem like a double whammy. With all of the careers to choose from, you still have many choices when it comes to being shy and poor at math. Think outside the box, and a world of options may open up to you.
The Legal Profession
While you may not be an aggressive attorney type, don't rule out all legal careers because of that. If you're not that outgoing, you can pursue other legal endeavors. A paralegal career is a possible choice for someone who isn't overly social and who doesn't enjoy math. Paralegals can research a case for hours on end without needing to interact with anyone, except perhaps their superiors -- you can leave the public speaking to them.
A Design Career
People in fields like graphic design sometimes spend hours in front of a computer without needing a calculator and without talking to anyone. Occasionally, designers must confer with co-workers and bosses, but they rarely have to give presentations or be in the public eye. Established designers may work independently, spending hours at home and perhaps only communicating remotely. Those in other design fields, like production artists, can work alone after they've initially met with clients.
Go for the Long Haul
Driving a truck for a living provides solitude for someone who appreciates his time alone. It's just you, the road and the shipment you're in charge of delivering. Also, this career doesn't involve a lot of mathematical calculations on a daily basis. With some basic training courses, truck driving is a job available to anyone who has the physical stamina to handle the occasional odd hours or demands of extensive driving.
When working in an office environment, the smaller the workplace, the better, if you're shy and introverted. Those who aren't gregarious and don't necessarily enjoy the energy of people do better in environments without as much action going on. Introverts appreciate peace and quiet. An administrative assistant to an executive in a small office could be a good career choice for someone who's less than outgoing. Most administrative careers require little in math skills as well.