Open youtube
GO on profile photo at the top right side of page and clicked it. After it click seeting.
When you can click seeting then page is open and you see three options at the below of your channel logo "Channel status and features", "Create a new channel", "View advanced settings".
You click on third option "View advanced settings."
After it new page is open and you see option "Delete channel", when you click it then google ask you to enter a gmail password to indentify you for your channel security.
When you enter your gmail password then page is open in which google ask you to enter your gmail which already written at the upside of field to indentify that are you human?
After it page is open which ask you about content you want to delete.
Youtube ask you that how much content you want to delete like delete whole content means whole channel and all content in it and specific content in your channel.
When you select delete whole content then youtube starting to delete your channel.
If your youtube channel contain large amount of data then it take more time like 15 to 20 minutes but in many case it take one or two minutes.
If you follow all these steups then your youtube channel sucessfully deleted.