Hmm, I know the verb is already conjugated for 1st person singular... I just thought it had to be reflexive, like it does in German, Spanish etc. You say ich fühle mich gut in German and cannot drop the mich even though the first person singular is marked by both the verb and the subject pronoun. Strange that it's optionally reflexive.
Hmm indeed. I'm confused. Check this out, in case you're still around: https://forum.duolingo.com/comment/9399864?comment_id=16881388