You may be a captive of the confines of your own overly scientific or mechanical mind. There's nothing wrong with wanting proof before you'll believe something, but there are times when your own skeptical nature prevents you from seeing the facts that are right before your eyes. You may be too invested in rigid rules and not open enough to new concepts and ideas.
In fact, you take every challenge as a slap in the face of your intellectualism, instead of engaging in an open exchange of ideas. Mentally speaking, the wheels of your brain may not be the fastest on the racetrack, and sometimes people with a faster wit leave you sputtering and annoyed. Later on you think of all the choice comebacks you could have said, but by then it's too late. You tend to look on the dark side of life and you're often in a pessimistic or depressed frame of mind. You have a disciplined mind, however, one that lends itself to serious study and advanced learning. You'll learn much more if you can be more mentally adaptable.