What advice can you give to someone who is afraid to be the person he really wants to be?
You got one life. You can live it for you, or you can live it for whom? Is that other person going to be happy for you enough that you will somehow find happiness for yourself?
It's hard to answer this without specifics. For some people, it's good enough to do something that pleases their parents because that is what is most important to them, but I think parents also what their children happy. If you do something to make them happy, but are miserable yourself, you might all just end up disappointed.
On the other hand, flying against certain cultural norms can be downright dangerous. Do you believe enough in what is right to risk it?
On the other hand, if you never try, you will never know, and you might just end up leading a life of quiet desperation. You wouldn't be the first, but again, you've only got one life.