<human>: Give me the gist of the text in a nutshell

TIFU: So today looked to be a bright day. I was trading up my skins for a first person shooter called Counter Strike: Global Offensive. Something I did in my free time with money I earned. I started a year ago collecting skins (cool patterns and artwork that are created by the community and put in game onto guns.) I was trying to get to the best skin in the game which are knife skins. They go for high prices and what not. So today I finally worked my way to that summit. I traded for a cool knife and had reached my goal that I set out to reach a year ago. It was awesome. So I decided to try and trade up more. See if I could get higher up on the totem pole. I got an offer that was really nice and started to talk to this guy. He seemed legit and wanting to not scam me. As we began to trade, he switched his deal up and without seeing it, I accepted the trade. I went from a $72 skin all the way down to an $11 skin. I was devastated. 20 minutes after I reached a big personal goal, I came crashing down to nothing. I was devastated. 

I'm sharing my story to tell people to not be selfish and scam people out of their hard, earned things. Please be kind to others. Thanks.
<bot>: Got a knife in counter strike that i worked to get for a year, 20 minutes later, lost it to some scam. Now feeling like crap.