Correcting my mistake

I remember when I get tricked by someone at Perbadanan Perpustakaan Awam Selangor (PPAS). I was waiting for my friends meanwhile I was reading a comic. But then, someone approaches me and after a few minutes, we got along very well. Since that, I didn't have any doubt about him when he asked me to show him my wallet. He told me that he only want to check if there was pig skin in my wallet. So, I just lend him without any feelings of suspicion. After a few seconds, he passed back my wallet and he told me that he wanted to meet his friends. In the meantime, I was feeling hungry so I checked my wallet and I was shocked that most of my money was gone. Then, I hurried to find the person I had just met but sadly, I couldn't find him anywhere. I gave up on giving trust to strangers. Since then, I'm starting to talk less because I'm afraid that situation like this is going to happen to me ever again.