I can not control my greed in gambling, because I want all at once and more. Because of this, first I lost a lot of money

It is same for majority of gamblers, many end up losing all they have won while playing. I have also seen one guy who won around 100
BTC in a dice site with just a deposit of 1
BTC and successfully cashed it out. But due to greed he came back on next day and lost all those 100
BTC + 30
BTC from his pocket.

Greediness will always put us on harm and sad for him instead of securing huge amounts of bitcoin he actually lose it all on the second day and for sure he regret on what he have done.He even lose more than to his winnings. Greed cant be controlled if you let your aims do control you specially on making money out of gambling because this thing will toss you up to play even more and wont stop as long you didn't get money out of it.