well the funny thing is i didn't come to the conclusion that i use a lot of Si by taking a test. I actually went to that link you posted and thats when i decided that based on that description of Si, i use it quite often. But im 99 percent sure that its Ni im using, not Fi.Well for starters can you explain how you see each function working out in your life? Sometimes people are confused about nature of functions. What they think is one function is actually another. If you list how each functions manifests in your life that may help straighten it out. Places to read about functions: ENFP Wiki & MBTI characteristics & 16 Personality Types & Intro to Function Theory: personalitycafe.com/cognitive-functions/24032-intro-function-theory-more-detailed-descriptions-each-function-attitude.html
I wouldn't trust the test too much because people don't always provide a very accurate evaluation of themselves. Sometimes they answer test in a way that they want to be rather than in a way that they really are. So then it fucks up the results.