In fact this is not just your problem but of many. Allah has created all food for us, like cereals; meat, beef and vegetables etc. He has created all the food including above mentioned with different tastes and benefits e.g. Cereals provide us vitamins A.B………. similarly meat is a good resource of protean. Milk provides us calcium, fats, butter and carbohydrates to our body.
Now so far as vegetables are concerned, it might be improved by cooking them along with meat. Ask your mother that whenever she cooks any meat, include vegetables with them. By this way you’ll get use to it. Moreover do some light exercises to make you hungry.