Sex stage fright

I can’t stay in the mood when doing anything sexual in front of my boyfriend, like masturbation or giving him a blowjob. I get so nervous. All I can think about is if I look weird or if I’m doing something wrong. How do I block those thoughts and focus on pleasuring myself and him? It gets so bad sometimes we’ll masturbate when FaceTiming and he wants to see me touching myself and I feel great but as soon as I set him up/show him my arousal goes down and I freak out because I don’t know what to do...

He’s super sweet and understands, it’s just me and my dumb stage fright. Any tips or help would be appreciated.

Note: most of the time we’re masturbating together on FaceTime, since we are ldr.