Elusivebutterfly,
It's taken me a very long time to become 'huggable' and then only to certain people, close friends and family know why!
If you're uncomfortable hugging or being hugged, do let people know, just tell them straight that you'd rather they just greet you as they'd greet a postman or binman with a simple 'hi', for example!
Hunni, never be pressured into physical contact if it's not your thing but don't feel guilty about it either, as we're not all lovey-dovey, physical hugging care bears!!
Go forth and do not hug.