Random suggestions:
A) Create a spreadsheet on GoogleDocs or Excel. Depending on your trade frequency, write down weekly (or monthly, or daily) starting amount and ending amount, plus an automated column for returns. Add some columns to automatically calculate a target and max loss for a given start amount. When you hit target, trade much more defensively (potentially even stopping on first loss). If you hit max loss, stop trading for that period (and potentially longer if you're trading daily). Make a strong point of sticking to this, it will protect you from yourself.
B) Ditch the group chat. Why hang out with losers that you admit are influencing you negatively? The majority loses money, don't hang out with the majority.
C) Figure out your edge if you have any... you can also add to your spreadsheet above e.g. your preconditions for every single trade if you have the stomach for it, so you can systematically go back and deduce whether signals had any correlation with returns. I don't do this personally but I saw an experienced guy here suggest it and I can see why it would help. If you don't have an edge, you will be on a gentle downward slope using the above rules that gives you plenty of time to react.