Then you should consider yourself fortunate.
Tap that!
Try to get them to like you back or move on
only if you like them back
When you like someone that doesn't like you back the general response is to just get over it one day at a time, it's hard but you have to face it.
It means struck with the back of someone's hand, like a slap.
get a make over.
ask them out
Become close friends with him\her.
One thing you can do is: Probably to work around it until they like you back.
You should find someone who likes you for you and if they don't then they are not good enough for you.
Ask him to go out with you
Justbask him. Plain, simple