Want to have without condoms but scared - for different reasons?

Hi there. My longterm boyfriend and I are discussing having without condoms. He has had a vasectomy from a previous unsuccessful marriage so there's not much risk of pregnancy (he's had a sperm count test done and i've seen the result) We have also had blood tests done although I have never had unprotected . The problem is with me. I find it kind of weird thinking of a guy coming inside me. I know that's what supposed to happen between a man and a woman but I find it kind of icky. He's not pressurising me in the slightest and is happy to keep using condoms but I would like to do this but cant seem to get past this fear. Can anyone help?