Note that you can also cancel request on that page.
1. Log in to your Facebook account if you’ve not already done that
2. Click on the two image icon at the top right of any Facebook page
3. Click find friends next to the friend requests option from the drop-down menu
4. Next, click on view sent requests
5. On performing step 4 above, the list of all the people who are yet to accept your request will appear.
5. To cancel a sent friend request, click friend request sent next to the person’s name and then choose “cancel request” from the drop-down menu.
See: Where do I see all the people I’ve blocked on Facebook?