I can't be physical?! Help!

So my bf and I have been together for about a year now. He wants me to give him hand jobs and blow jobs... And I tried giving him a hand job only once and I was SO grossed out I only touched him for like 10 seconds. Sex doesnt gross me out. Just the thought of giving him a hand job or blow job... I really don't know what to do. And it's not him either! I feel like if I was dating anyone I would be the same way... I dont know what to do. He told me we can "work on it" but just the thought of me doing that grosses me out a lot and makes me feel nauseous too. 😷🍆❌