Partners and gag reflexes. HELP Lol

Sarah
So there's a guy I been having sex with and he wants me to give me a blow job. We're not in a relationship but besides me there's this gay girl that like once or twice a month wants dick so he has sex with her. For one how should I feel about that? And two I'm nervous about blowjobs because of my gag reflexes what can I do about that??