If you are finance majored and you realized after 2 semesters you are actually doing bad in all of the finance major classes, should you declare another major and start over?
If you continue to do bad in your 'major' classes, then you should seriously give it some thought that maybe this major is not for you and make a change before it's too late.
You need to think about if you are doing bad in school because the way you study or you are really not grasping the concepts. If you are lazy, then regardless, you are going to do poorly.