You don't understand the impacts of joining such groups. The economic gains are often negative but the political pressure that can be exerted on Bangladesh by member countries could be immense in comparison. Y
Joining ASEN could be a disastrous. In the future there will want to build road links and so on, and even have open borders. Think before blurting out nonsense.
highlighted part shows extent of your education, geo strategy is way out of your league and keep it that way.