Boyfriend doesn't like blowjobs

My boyfriend has never had a blowjob before, he is very insecure especially about his penis (he has a completely normal penis) so won't let me to give him a blowjob and he thinks neither of us will like it. I really want to do it, but I'm not sure whether to just respect his wishes and leave it or slowly encourage him into it?? Helping him to feel more confident in the process?