Personally, I wouldn't read too much into whether or not you should convert to southpaw based on your experiences with a guy who openly admits he didn't know what to do against one.
Also, and I don't mean this disrespectfully, with a chin as dodgy as yours I think you would be well-served to focus on improving your currently non-existent defense. Otherwise, everyone you fight is going to keep countering your wild punches with straight shots, and you'll continued to get hurt and dropped in every fight you're in.
Good luck in your upcoming fight.
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