Google Adwords charged way more than I thought it would?

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Hello

You should have set up a daily budget at the campaign level of $2 per day - although I'm not sure if a budget that low would even run (never tried it myself). The other option is to set your billing to pay up front and then top up however much you want to spend. It looks like to me that you set the account to run however much the campaign allows and bill you after.

Your best bet is to call the adwords team, they may be able to help you out by crediting the balance back into your account and setting your daily budget correctly. But that's just my guess, so don't quote me on that.