I lost my savings and feel like complete idiot

So, two days ago I went to the ATM to get some cash, nothing too big, just needed $5, and then returned to my car. This ATM is inside a mall with a payed parking lot, and they charge you based on your time spent there before you leave. They have these machines where you introduce your ticket and charges you accordingly. Well, then, at the checkout I noticed I didn't have any more cash left with me (stupid, I now) so I returned to the ATM in a hurry to get some more to leave the fucking mall.

Turns out, and I noticed it a day later mind you, that I forgot to cancel any more transactions and actually left my card inside, ready to be used by anyone. The opportunistic motherfucker who found it straight got out everything from my account, free money. I checked the time when he or she or whoever made the transaction and not even a minute had passed since I left the ATM, NOT EVEN A MINUTE. was the guy standing there waiting for someone to lose his card or something!?

So here I am, having already reported my card to the bank and getting a new one, feeling like a complete idiot. I don't know how did I forget to get my card back, I really don't. I'm forgetful and often lose many things but not stuff that goes in my wallet, well, at least not until now. I hate it so much, now I have to replace all that money I lost, at least it wasn't so much, but I'm an undergraduate and I don't have a job yet, so, yeah, f**k.

Wherever you are, I hope you are enjoying your free money, asshole