Can anyone help with how to talk to my boyfriend about oral?

My boyfriend and I recently were making out and having fun, and I ended up giving him head. I don’t regret this, I love him and enjoy making him feel good. Afterwards though, he offered to do oral on me too, I turned him down and he was fine with it.

But I said no because I’m embarrassed by my body, as I don’t think I’m attractive, and i don’t want him to have to see me naked or touch me.

The second part is that I don’t orgasm easily, and am afraid that I won’t climax for him and he will feel bad that he wasn’t able to make me do so.

Does anyone have advice for what I should do or how/what i should say to him about it?

Help please?