Make up can reshape your whole face! It's plastic surgery in a bottle!
However....there ARE other tricks you can use with your makeup! This video shows an eye lid glue that looks pretty effective. But I don't know how many hours it lasts, or if it's sweat resistant, so look that up!
YouTube - Japanese Single Eyelid to Double Eyelid
Check out this makeup tutorial for "anime eyes"
YouTube - Anime Eyes Tutorial