Financial background should be your first consideration above anything else when you are deciding whether to further your studies overseas. If your parents can afford without much burden, then you are fortunate enough and may take this opportunity to broaden your mind. If you have to undergo a tight budget when studying abroad (like you need to take part-time job, parents sell a house/ loan), then you definitely should not.

We can't change our accent even we have been living in overseas for more than 10 years unless we move there when we are small, like before primary school. We have our own Malaysian accent, this can't change. The only way we can change is to speak "proper" English or follow their way of speaking (means use the expression they usually use) in our accent. They can understand as well as long as it is English, not Manglish. It is not necessary to pretend to have a certain accent.