How to orgasm vaginally

My boyfriend and I have been having sex for about a year. At first it was somewhat uncomfortable because he's large and I was a virgin. Now I get this feeling while we're having sex where I feel really emotional. I love having sex with him and it's great, but I just can't come for him with just him inside of me. Sometimes I rub my clit and other times he finishes and then pleases me orally. Please tell me how or what to try because he feels bad sometimes that he can't make me orgasm that way even though I tell him it doesn't matter.