How dangerous is it to walk home alone at night in this situation?

I live right near a busy main road; and it’s a 3 minute walk from the bus stop on the corner, from where I get off the bus, to my house, which is on the corner of a dark and quiet road; the first house. We have a security door and I always carry my key in my right hand, hiding it. So I can open the door quickly and also, just in case I get attacked. So I can use them as a weapon. I live in Australia. I come home between 9-11pm at night on nights out with friends.

How dangerous is it to walk home alone at night in this situation?
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