Re: PLZ HELP ME
you were 15 when you first 'met' him and now you're only 18.
i have to say that all the people i know that got together with someone during their mid-teens, even though they thought they would marry that person, even a few who got engaged at 19-20...** none** of them actually ended up marrying that person.
that's not to say you wouldn't (if you guys worked something out) but you really need to be aware that you're still maturing, your ideas on life are still forming. life is a lot more idealistic when you're younger. let's say you were making this decision in 5 years time, your thoughts might be completely different. so like everyone else has said, you need to wait.
you say that you only need to resolve this now as you can't get engaged until it has. i don't get what the rush is to get engaged? he's only 23, that's young for a guy. he may be getting proposals everyday but if he says he will only marry you, then he can tell his parents that and tell them he's not ready to get engaged yet.
it doesn't seem that your own parents will mind if you don't get engaged yet. so just concentrate on your own life; education, experiences. let him concentrate on his education and taking care of his parents and sister. see how things go.
like others have said, he may be willing to move later or your parents might come around to letting you go or you might decide you don't want a life in pakistan at all.
summary - forget about this engagement lark. these decisions need making when you are ready to get marred.