This instrument is not highly validated, but it will give you some meaningful information. If you want to be more confident of your type see a trained and certified administrator of the MBTI instrument and spend the several hours necessary access and understand your type. Better do this with a group of your associates and use the results to improve your skills working together. I use the MBTI as a self-disclosing instrument and exercise in teambuilding. It allows us to see our profound differences that we are not aware of unless the others share what they think and feel.
Type is about our innate, usually unconscious, preferences.
It is not about skills or abilities. Type Resources is the organization that I learned the most about type from. This is relatively new site which offers links to many other MBTI sites on the web. It is done well and is fun. The MBTI is a large part of this research in personality assessment performed at Virginia Tech .