My boyfriend doesn’t want to go down on me

We recently started dating & we’ve had sex twice. Both times it was just painful & I didn’t cum. Its only my 3rd time having sex ever and I’m still discovering how I can get off and make it better for me. We talked about what we like & want in those moments but it hasn’t happened yet. I go down on him every time because I genuinely enjoy it. How do I tell him I really want him to eat it without sounding too aggressive?