It is impossible to get double lids without surgery or help of tapes and glue. Since you are born with single-fold eyelid, there is nothing you can do about it. If you really want to get double lids, I suggest you to have a surgery which is safe and has low risk. Certain ways of make-up can also achieve your purpose. You can google some videos or pictures that teach you how to make your eyes look more beautiful. A clip may also help you. You can wear it for twenty minutes in the morning. By doing this, you will have two creases on your lids during the rest time of the day. However, this will not give you a natural look. Try double eyelid tape for ten months, the effect may be amazing.