Internal/external Orgasms during sex

I don't know if I don't know the feeling or If it's just not the same but I only get an orgasm when I ride my boyfriend or when he eats me out. I've never gotten one with him inside me and f**king me. It feels amazing but it doesn't feel like the orgasm I would get from external pleasure. Is it the same feeling or different? Any advice on how to cum from sex?