I'd vote for applying. Your most recent resume isn't what you'd like it to be? (Go with me on that wording, ok? ) Yup, tweak it.
Honestly? I don't see any reason to feel humiliated.

People don't respond. It happens all the time. ESPECIALLY in the job market these days. I was astounded to get 2 form letter (well, email) responses that they had even received what I sent, let alone an actual response. It just doesn't seem to be the way things are done anymore. Even if they know you. Think of how common not RSVPing is -- and that is often by those considered near and dear(!)

It's too easy to take lack of response personally when it's not, and really, that's the main thing making you hesitant, isn't it? And there's an overwhelming likelihood that it isn't anything personal. I say go for it.