These words are similar and can be interchanged equally depending on how you use them. For example: 1. You may wish to go to college in the future. 2. You might wish to go to college in the future. --- But they can also be used differently. A good idea is to you "may" when talking in present tense. Use "might" in past tense. For example: 1. I may go to the park today. 2. He might have went to the park before he went home.