Imran was similar, he refused solids until he was maybe 8 or 9 months old (I have a shocking memory - sorry) and even at a year old it felt like he didn't eat much solid food but these days his appetite is a legend in his 'village'. If there is food around he'll be sure to have some in his hand lol. He's still not fond of spoons and being fed by others but he's happy to eat finger food for hours on end.
6 months is still early days - the first few months of solids are more about learning about tastes and textures than the nutritional value. Eating solids isn't a developmental milestone that babies need to meet by a certain age so there's no need to stress, if he's still having lots of breastfeeds you can be confident that his nutritional needs are being met and when he's ready he'll start on other foods.
It sounds like you're doing a great job breastfeeding - congratulations