"People think I'm a miserable sod but it's only because I get asked such bloody miserable questions"

In this quote, musician Nick Cave is revealing frustration with the method he is perceived by others. He acknowledges that individuals often see him as a "unpleasant sod," or someone who is constantly dissatisfied or negative. However, he discusses that this perception is not completely accurate. Instead, he thinks that the factor he might come across as miserable is since he is continuously bombarded with "bloody miserable concerns." This could describe the kinds of concerns he is asked in interviews or the subjects he is expected to go over. In general, Cave is highlighting the effect of external factors on one's demeanor and how it can be misinterpreted by others.