An instinctive, machine-like reaction to pain is not the same as consciousness. There might be more to creatures like plants and insects and this is still being researched, but for now, most of them appear to behave more like automatons than beings of greater complexity. It's pretty straightforward to completely replicate the behavior of e.g. a house fly in software, but I don't think anyone would argue that this kind of program is able to achieve self-awareness.