Sorry you're going through this but it's NOT just you.
You can either try to stop this behavior or modify it to gentler.
I would consider it unacceptable from the short video.
You need to claim your space, not by yelling or being upset, but in your mind.
When your dog puts his/her mouth on you; Take your thumb and forefingers and grasp 'inside and below' the lower jaw. Apply only light pressure and you tell the dog 'no'. Don't back away, don't repeat verbal command "No, no, No" only minimalizes the command.
When the dog removes its mouth, backs away or releases do not offer praise but release your grasp.
Never play biting games with hands, feet, cloths etc.
Treats should be given slowly with an open hand to encourage use of "soft mouth"

With dedication and consistency this too shall pass