Why no one likes me

I'm 20 yo female, I honestly would say I'm like a 6.5/10 or sometimes a 7, but for some reason, no guy likes me, I had so many guys online who were interested in me but in real life? Never. Idk if I'm not approachable or what cause I do look mean, but I'm not really. And I think with all my flaws, at least someone in this world should like me, am I wrong? I'm honestly tired of seeing everyone in relationships, even people who don't have a single good attitude, and yet me? Always the single one... I really need a guy opinion on this, or even girls, someone tell me if its that something is wrong with me or what