There are a few reasons why vegemite might taste bad to you.  Firstly, it is a very salty food, and therefore it can be quite overwhelming if you're not used to it.  Secondly, it has a very strong flavor, which can be quite off-putting for you.  Last, it is quite tricky to get the perfect balance of vegemite to bread, and if you don't do it right, the vegemite can end up tasting quite bitter.  However, many people absolutely love vegemite like us. It's absolutely an acquired taste, but once you get used to it, you might find that you can't get enough of it.