Well, its due to a few things:
1. My mum isn't allowing me to buy anymore games, since I'm doing a university pathway course in year 11 high school, so she doesn't want me to be distracted (even though the last game I brought was Sins of a Solar Empire: Rebellion, of which was about a year and a half ago). So I can't exactly use her credit card.
2. My debit card is just an ATM card, so cannot be used online.

So, has anyone got any idea how I could get Crysis 3 exactly? No, I don't want to torrent it, since I do wish to play MP. I'm considering giving money to friend to buy it for me, but trusting $80 to someone is rather risky.

Is it a good friend? Heck, I had someone at work entrust me with over $100 to buy a program I don't use with my college discount for him and he paid in advance. Anyway, if it's a good friend, he will not be a jerk I would hope or else you made a poor decision in a friend.

You can just go to a retail store buy crysis 3 from there and then buy a gift card for yourself and use that online.

If that's even possible (gift card idea)

Break into a DVD store and steal Crysis 3. Or you know... Just buy it from a DVD store