The odds that an 18-22yo traditional college student will overlook a 5-9 year age gap because you share a lot of interests and can have interesting conversations are much higher than the odds that another 13yo will overlook the fact that you have no shared interests at all because hey, you're the same age.
I found it extremely difficult to make friends until I got out from under the limiting influence of my parents who didn't want their kid to be "weird."
Now I have a whole bunch of weird friends who are fascinating, joyful dorks, so it's not hopeless either way, but I'd have loved to experience this much sooner.