Might or may?

[marantha]

Been struggling with this one for a long time.
What's the difference?

There is no difference between may and might worth agonizing about. May sounds a bit more formal to my ear. And may cannot be used where a past tense is required in tense matching: I knew I might be late. Not I knew I may be late. In other situations, both are used the same way.

^From an English forum- I think it puts it quite well though.