Blow job bother

Perrie
Heeeeey guys, this is the first time I've posted.
I'm 21 and I've never given a blow job, I broke my jaw when I was 16, and even though my jaw doesn't bother me anymore I get the worst anxiety ever and I've just used my jaw as an excuse to not give them cos I'm nervous that I don't know what the hell I'm doing, but now boyfriends have ridiculously finished me in the past over not giving them so it's becoming a really big issue, which is now giving me more pressure and then I get anxiety worse and ahhhh help me ladies 
😩😩😩