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Okay, so I’m an ISTJ, which shares one cognitive function with an ISFJ.

Not to get too deep in cognitive functions, but here’s the stacks for the two you’re considering:

ISFJ- Si-Fe-Ti-Ne

INFJ- Ni-Fe-Ti-Se

Fe, or Extroverted Feeling, is very compassionate, wanting the best for the group (e.g. How do they feel about this situation. To quote MBTIfiction.com, they are:

Morality derived from without, based on convention and what you’ve been taught.
Motivated primarily to stay true to the group.
More in tune with other people’s emotions than your own.

Both types you have use high Fe, which would explain the confusion. The difference is the Si/Ni. Now, don’t believe what stereotypes would tell you about sensors not being creative. It’s false. Sensors would just be much more in tune with their environment (internal or external) whereas Intuitives are stuck more in the ideas and what could be.

To quote MBTIfiction again, about Si:

Experience life as a series of memories, constantly comparing the present to the past.
Has a traditional approach and relies on experience for decision-making.
In tune with how physical environments affect the memory (“this smell reminds me of my childhood”)

Si also is much more detail oriented.

And Ni :

Narrows the focus to a few ideas and sees them through to completion.
Isolates potential problems.
Focuses on long-term goals as realities.

Ni is much more of a big-picture thinker.

Anyways, hope that helps. Another good site is Psycology Junkie for studying the types a bit more.