self conscious of my vagina

I am so self conscious about my vagina. My inner labia sticks out a lot and I have done all the research and I know other people have this too but I still can't have any confidence. My boyfriend wants to go down on me but I'm just so nervous what he will think of my vagina because he has already gone down on other girls. Should I at least warn him before he does? I'm insanely nervous and self conscious. Thanks!