I am done doing my homework
This sounds odd to me and I don't understand what "doing my homework" is in this sentence.
I don't understand how the phrase "I am done" (I assume "done is an adjective here, passive voice doesn't make sense to me) can be followed by this -ing phrase. Sentences like "I finished doing my homework." are easily understood and the gerund could be replaced with a noun ("I finished my homework.") This is a different kind of construction of course. But instead of "to be done doing" I would say "I have done my work" or if I want to keep the "doing" maybe "I am done with doing my homework." Otherwise I find it unintelligible.
Also similar constructions use prepositions too for example "I am tired of being alone" "I am fed up with being single" this one does not.