To spread some positivity: Don't forget that many women have a hard time reaching a purely vaginal orgasm to begin with. It's actually impossible for some. And while some can, you still need the stamina to get them there, which can be really though, because women take much longer than men on avg. And if that wasn't enough, you can even be too big for some.

Even more true for male partners.

Long story short: There is a big chance your size doesn't matter too much. There are plenty of partners for you, likely with problems of their own.