Qubix

Ok, I know this question is very old, and it has probably been answered by now, but if the electron does not have an internal structure (like the proton for example), how does it maintain itself as an entity? Why does it not disintegrate?
I've asked this question a couple of times before ,and people answered with things like "it's a fundamental particle so it does not have an internal structure"... this is obviously not a scientific answer, for 100 years ago, we might have said the same about the atom.