It doesn’t make you a bad scientist as a hypothesis isn’t meant to be accurate, it’s what you think will happen. Your experiment can be the opposite of your hypothesis as your hypothesis is not what you observed. For a scientist to be a good scientist, he or she needs to experience trial and error before succeeding.
A bad scientist would be someone who would ignore is thesis and not find the correct solution. A good scientist will conduct research and test to identify where there needs to be improvement.