Well, take heart that just being from Stanford isn't a guarantee. If anything the middle-of-the-road job you have now is more of an ironclad guarantee than any VC-funded startup. Plus, you got to do what you wanted after college instead of flailing around and getting burned out.

On the other hand, a Stanford degree is a signal, and will still serve you well for quite a few years yet. My name-brand diploma is decades old but I'm pretty sure it still gets me second looks and interviews more often than I'd care to admit.