how can our reason conquer perception?

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Every time I lose something,I feel so bad.I know it is not worthy for me to regret something that had happened before.But still sad.After I take my major in economy,I know it is called "sunk cost".If this bad mood affects the rest of our day ,or may the whole week ,we will lose more.The best way is just let this memory go away. Today this stuff happens again.I lost my money,and what did I do ?Honestly my eyes are still swollen from my own tears.No one ever blame me for that.I feel so guilty for a long time because my parents earn those money so difficulty.My stufy was certainly influenced by it. I am aware of what I should in this case. However,It feels that emotions are so powerfu that we just let it control usl.