Am I Embarrassing?

Not just an age thing. There used to be a colleague that in work was more than suggestive, when I met him outside with his wife he replied with a very quiet Hello to my greeting him with a big smile!

I would have been pleased to get a word out of my 13 year old son if we were alone in our house!

Definitely an age thing

Oh the possibility that you might want to actually engage in a conversation would be flipping scary.

Did it and had it done to me!

It is quite normal, I know I was the same, being painfully shy. I am not much better now and will sometimes pretend I haven't seen a slight acquaintance if I think I can get away with it!
I once saw a 13 year old boy hiding in a phone box so that his grandmother wouldn't see him and possibly embarrass him by hugging or kissing him.
Unfortunately she saw him and dragged him out by the ear, much to the amusement of his friends.

Worry not. When I was chair of governors at her school, my daughter flatly refused to notice I existed if I passed her in a corridor.

A few years on, you’ll be delighted when young men and women you don’t even remember greet you warmly. I was eating in a pub the other night, and the waitress, whom I briefly taught 8 years ago, was eager to say hello and chat, even though I couldn’t remember her name.

Yes, it’s an age thing! I might have felt the same, can’t really remember. It’s such an awkward time of life for young people but they will all grow out of it.

I would have been too shy to say hello to a neighbour, but might have replied if they had spoken first.

I wouldn't take it to heart. It's part of being a teenager. Most grow out of it and become human beings again.