ofcourse he scammed you mate. you shouldnt have gone first. the reason he is selling so cheap is because its a scam.... and it usually tricks the buyer into going first cos their panicking thinking they have got a really good deal!!! if he was selling $2/M he wud have gone to r2pleasent. think about it. if it sounds to good to be true, it usually is.
To a certain extent I believe it's your own fault and you should have been more careful with who/how you are trading.
On the other hand you're new...contact your credit card company and inform them of what's going on and you should definitely get your money back, just make sure you learn from your mistake.