I can orgasm alone, but not with my lover. Is this my problem?

When everything is going well, I suddenly come back and say it will be okay, but every time it is interrupted, my lover wants it too and we try for hours and eventually we get tired and finish it. Sometimes I'm happy too, but it's very rare, most of the time it seems like the problem is me, but when I'm alone, I orgasm immediately within 5-10 minutes. Maybe, I don't know if it's my problem or not, if anyone has experience on this issue, I'm looking forward to it.

I can orgasm alone, but not with my lover. Is this my problem?
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