Can’t orgasm from sex

I have had sex with my FWB for like 5 months now, and I’ve never been able to orgasm once 😭. Don’t get me wrong the sex is good and I feel pleasure from it, but I just can never seem to finish. I’m EASILY able to orgasm when it’s myself but only when I’m watching porn. I can also finish without it but it just takes a lot longer..idk. I just felt like ranting about it. I just really wanna orgasm with him😩