Kissing & sex...

Me and my boyfriend have only kissed once and it was before we were even together.... and we’ve been together for over a month. And he asks me if i’m dtf sometimes but like how does he expect us to have sex if we have hardly even kissed?? I need advice on what to do because i want to get more physical but also i’m scared because the last person i was with sucked at kissing and it was gross and what if thats what it’s like with my boyfriend? how do i make sure i’m not a bad kisser?