How come losing 100 euro feels awful, but winning 100 seems like nothing?

I always try to win an extra 50 or 100 everytime I get paid, just so I won't have to spend my wages on bills or something I want to buy. But when I actually win 100, I don't get excited or anything because I know it's not significant and won't change my life or anything. However, when I lose 100, I desperately want to win it back.