If you are an INFP you are Fi dom. So you should easily be able to distinguish once you get an understanding of Fe and observe how it works. Unfortunately, there is a lot of confusing (and misleading) descriptions of how Fi and Fe differ.
INFJ aren't feeling doms either, but their feeling function is often played up in descriptions, perhaps because it is extroverted so more obvious than INFP's. So if you most relate to the feeling function in some common descriptions (which barely describe Fe) you may be infp.
But yeah--look at ESFJs--that should help you understand whether you are an Fe user and they are fairly common (and no--they are not really like 'your grandma' the way some stereotypes describe--more like fashionable, popular hostesses).
And then perhaps try to understand how Ne works--jumping from idea to idea, getting engrossed in one and then moving on. Open ended brainstorming vs. narrowing down and clinging to conclusion. I would imagine INFJ wouldn't relate well to Ne, just as INFP wouldn't relate well to Fe (unless looking at a misleading description of Fe--such as 'cares about harmony' or 'doesn't value one's own emotions above others' which are both bogus descriptions).
You could also read Jung's descriptions of Fi and Ni, and then Fe if you want.
Ni snapshot (INXJ): Either the mystical dreamer/prophet type, and on the other hand the fantastical crank. INFP might be able to relate to this a little bit, but just ask yourself how significant the role of feeling plays--if it's more significant than intuition, then you are more likely to be feeling-dom like infp.
http://personalitycafe.com/infj-art...on-introverted-intuitve-type-ni-dominant.html
Fi snapshot(IXFP): Deep, intensive feelings. "Still waters run deep." Rebuffs strong emotions when overwhelmed--when unhealthy may be prone to scrutinizing and suspicious behavior towards other people's true motives (thoughts), pushes away, rejects and makes others feel undervalued when stressed.
http://personalitycafe.com/infp-articles/70527-jung-introverted-feeling-type.html
Fe snapshot (EXFJ): Agreeable with the valuations of others ('I agree that painting is beautiful because others do'), more involved in group/community events--more comfortable around groups, when unhealthy gets absorbed into object and attaches negative thoughts to it, and appears inconsistent and contrived when stressed.
http://personalitycafe.com/esfj-art...ion-extraverted-feeling-type-fe-dominant.html