I panic, alright?

I just don't know how to do it. When I'm not sure how a person works, and they talk to me as if they know me completely, I freak out.
When they come to close, phsyically or mentally, I just panic, alright?

I don't know how to change it?
I have changed alot since I came here, but not completely.
I don't know how to do it.
I don't know what to do.
I try to, but I just push people away, I just can't do it.

Please help.
And then they get scared or just think that I am completely retarded.
And then I give up.
And nothing good comes out of it.

I need to get help, I just can't function socially here in Australia. Why am I so afraid of hugging people? The slightest touch, unless I actually ask for a massage, or if I'm drunk, it just makes me crinch (if that's a word).
I get over it after a few seconds I guess, but I can't hide that instant wish to get the h-ll out of there. Everyone can see it. And then they think I hate them or whatever. Well, I don't, I just need time...alright?