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I am the worst gambler in history, what reason is there for me to live?
No you are not the worst gambler actually you fell into gambling addiction which make you lost whopping 10BTC in 3 days. But you should now realize it and move on with remaining 15BTC. Stop gambling and stop trying to recover your loss with your remaining bitcoins.
Good luck
Yeah your situation may be bad but you haven't lost everything just yet which gives you a chance to actually make things right. Of course its a big amount to lose for a shirt time but consider the fact that you'te lucky to have something left to start with. Some people can have lost almost everything so just be thankful, move on and be smart with your money