Yes, I'm aware of other European countries' customs regarding strangers. But where I live it's considered rude if you don't say 'hello'.
Alright then, I might need help someday, then it would be fine to be asked, but nothing more! I don't like watchers. I can't do things good if I'm being watched!

Like you, I can do pretty well in one-on-one situations, meaning I am sort of talkative, but still don't know when to stop (even if I'm not talking about my interests), how to be interesting in a conversation or how to be 'cool'.

Also, am I the only one who feels more comfortable talking to the oposite sex? Though it depends on the person and how well I know them.