One important factor seems to have been missed from the above. Your SERPs position.
Before you panic too much about your CTR you should try to get some idea of what you could reasonably expect the CTR to be 'on average'.
If you are on or about that % then even if it seems low - it could be OK. (Though you should always consider whether your title and description are helping you as much as they can or not).
Although I'm not guaranteeing these percentages from this site they seem to have some resonance across a whole range of % I've seen over the years.