I did, and unless you're in a situation similar to Dawn's, I don't think it's really a huge thing.
EVERY teenager feels insecure at some point. I remember being on MSN, and saying to people, "Do you think (example name) Jenny likes me? I know I'm really annoying..."
It's only when I got a little older, 18ish, that I realised that everyone HAD liked me, and if anyone didn't, it's because it's annoying to be constantly worried about people's opinions of you.
I still sometimes feel like I'm ignored, and people are talking over me, but I recognise that everyone feels like that sometimes. It's part of life, and it's not personal, and it's not intentional either.
I'm a lot happier now too 🙂