Would this be enjoyable for a guy? (Bj help)

So I'm pretty terrified of giving my boyfriend a blow job. I have intimacy issues and bad anxiety even though I'm only 17, and because of my anxiety I have an overactive gag reflex (which sucks because I'm terrified of gagging/vomititng). But anyway, I know he wants one even though he won't say it bc he knows how I feel about it so I might try it tomorrow. I've never given a handjob or blowjob and I'm the only girl he's ever been with. Would it be weird if I just sucked/licked the very tip and then used my hands for the rest? There's absolutely no way I could take more than that without panicking and gagging. :((