Your friend's dream strongly suggests that not only does she know your spunky temperament well, she actually has some anxieties about how you use it at times. The violent setting is easy enough for the mind to conjure up as a backdrop - we hear of it all too often.
What unfolded in her dream doesn't really surprise you given what you seem to realize of your own nature. Yes, it is stupid - but the reality is that you have little control at that point and making a perfectly logical announcement as you did only serves to make you an obvious target for lethal attack.
You must have admirable backbone and sharp insight - but also must act a bit rashly on these things at times - something that, again, concerns your friend. It is a warning of sorts that she was given - and has wisely shared with you.
And by your own dream, it seems that you got the message to some degree. Your dream of the owl is interesting - and the rather standard answer you found on line may mean that - but those meanings are general at best and real meaning depend on your own outlook and experiences.
Owls can represent wisdom, nobility of spirit, a silent, invisible preditor of the night - one who comes without warning to fetch its prey in great strength and speed. Death is obviously among those things - and the steady stare of the owl can be most discomforting and convey a feeling of condemnation, well enough.
Hence, the owl may well reinforce the warning your friend has shared with you - rethink some of your reactive ways before you fall prey to them. A wise but preditory creature's appearance may have visited you to leave you with a bit of a chilll upon this realization - think of that.
Just a 'bird'? No, owls are special - study them if you don't know this - they are among the most flexible and capable birds of prey and have an animal insight that can appear nearly supernatural. That is nearly imprinted in the human psyche, even if it needs awakening in the individual. And this one in the picture gazes upon your condition in life - likely to affirm the reality of your friend's concern.
None of this means that you are in some mortal peril because of your nature - not in the immediate or precise sense. The 'warning' has more to do with what you might consider doing with your outspoken nature - there are productive ways to use what you have, and most admirably. But you must learn to master the thing and not let it master you into trouble, ordinary or perilous as the case may eventually be.
These things are suggested by the dreams - but you will have to consider real context for yourself and decide how they apply, of course.
I wish you all the best - and never sacrifice that spirit you seem to have, albeit kept in thoughtful ways.