Nervous Wreck 

Someone who is extremely worried or very nervous about something and they just can't hide it no matter how hard they try.

Before going on the stage in front of 10000 people, Tom was a Nervous Wreck.

Nervous Wreck by Jimmy Rooster September 29, 2020

Nervous wreck 

When you try and give someone a hand job and don't know how.

Yeaahh, he even admitted that I was a nervous wreck

Nervous wreck by Ginger bush June 5, 2014