I weigh the importance of my own feelings and the feelings of the outer world and choose according to what I think is the priority; for me personally it means I almost always put my own needs and feelings aside. Not that I'm so great or wonderful for doing this, and it's not always the healthiest choice, but it's just what I do. The perception that Fi (and thus the Fi user) is all about "Me, Me, Me - my priorities, my feelings, my needs FIRST" has always troubled me, because that's just not how I personally manifest in the world.
Of course, I think this would express uniquely in most Fi dominant individuals due to the inherently subjective nature of values in general.
Ironically, I have suppressed my own feelings for so long that now at this time in my life, when I have more time to direct what I want to do without as many external pressures, I find it hard to know what I feel and what I want to do. Talking about that would be a massive derail though; thanks to all who have persevered in this thread.
sim, I'm proud of you for expanding your understanding on the topic. Never stop questioning! Conclusions often masquerade as fact when in reality they are merely theories inadequately tested and are fluid rather than concrete, continually evolving and changing according to both our own personal knowledge and the collective knowledge gained by humanity at a particular point in time.