tips for blowjobs, help me pls

sooooo ya girl needs some help please. I’ve never gave a blowjob in my life and lately when me and my boyfriend have been having sex, in the heat of the moment he will ask me to give him a blowjob and i still literally just freeze like i don’t know what it is but i just freak out at the thought of giving a blowjob.

Although he says he’s not bothered by me not giving him one and he’ll comfort me, i still feel like i’m disappointing him, sooooo basically what i’m asking is how do i get over this irrational fear of giving a blowjob and some tips for when you first give one. thanks