With ASEAN members having many different languages it is important to be able to communicate well with all the different countries, some already have English in common use, for example: Myanmar, Malaysia, Philippines and Singapore, so having a good knowledge of English is going to give me better chances to my future career. Most countries with their own language have a very limited knowledge of the other languages among the other ASEAN members. English is a good common language that can be used to good communications between members.
Even if I could speak well in the language of a neighbouring country, this would still limit how well I could communicate with any of the ASEAN members, so my good knowledge of English is very important for my future and for opening all career opportunities.