This is fun:
True -in accordance with fact or reality
Reality - the state of things as they actually exist, as opposed to an
idealistic or
notional idea of them.
Thing - an
inanimate material object as distinct from a living
sentient being
or - an object that one need not, cannot, or does not wish to give a specific name to.
and back to your defintion:
"The definition of fact is this: A thing that is known to be true."
Now known as per knowledge - facts, information, and skills acquired through experience or education; the theoretical or practical understanding of a subject.
So your feeling has to be a fact as a thing known as true. But it is not a thing, so it is not a fact or true, as per this claim of yours:
"Thank you so much. I feel like my life is worth more than a cat's life, even my two cats. I also think it's worth more than a fly's life, or an ant's life."