The beginning of your problem was when you decided to listen to what others had to say, gambling is a personal thing, meaning that it's always you and your ideas only. 20000 BDT is a lot of money and I think you should have just walked away with it instead of gambling to make more profit. Learn to have limits that you always keep to no matter the pressure. At the end of the day you were the one that lost after letting others force you
It's not a matter of listening. He said that those other gamblers in the table forced him to continue. Doesn't really mean they threatened him directly, but just imagine someone who is not familiar with such a practice in an unsafe place and all the others "ask" him to stay and continue. Usually in social gambling, it's commun that the loser always has the right to take the final decision to stop the game or to continue considering hos right willing to recover his loss. Fights always begun with this introduction.
This is why i consider this kind of gambling not suitable for everybody, especially if you are not feeling safer with whom you play with or in the place which should always be hidden far from the eyes of authorities.