If you believe your copyright-protected work was posted in YouTube, you can submit a copyright infringement notification. Here's how: https://goo.gl/JK9yY5 . Hope this helps!
there also something else going o on youtube there is a guy that use alot of accounts to go on streamchats. he also stalk people in game gta and he is using my name and from others to talk bad about it and stuff he stream snipe people and he is threatening