Hello
This is my Transaction ID: 21b2fc39030c091090693ae8910f06b17ddd2ca9d5f579600cd85d4eb51470c6
please help me
Wow, that is a huge sized transaction with a really low fee + very small change. It could take awhile before that transaction confirms, if it ever does. Blockchain.info says their node even rejected it due to the fee being too low.
Did you have the "Enable Replace-By-Fee" option enabled in Preferences->Fees? If so, this may make it fairly easy for you to include a higher fee. Otherwise you'll likely need to attempt to double spend it or wait for it to get rejected and fall off the network so you can respend them.