I've never wanted to 'become' a boy... I just always was one. The only thing I desired was to become RECOGNIZED as the boy/young man that I was/am. There's nothing special about being male or female... but being yourself, and being recognized accurately as who you really are, IS special, especially when you've been denied that for almost 2 decades (or even more) of your life.
There are pros and cons to being male, and different pros and cons to being female, neither is better. But there are NO pros to being FORCED to live life being seen as the one that you're not.
EDIT:
I was typing this post as Cai made his, and didn't see it until after I posted my own... so I'd like to add a comment about his post to this one.
I don't agree with that. In the future maybe it will be true. But as it stands, there are restrictions on what will be accepted and allowed from males vs. females. A BIG one is attention towards children. If a woman stops on the street, or in a supermarket, or wherever... and makes a fuss over a baby or child... they can act extremely bizarre, and make a scene with their 'cutesy baby talk' behaviour, and while in other circumstances they'd be deemed insane for acting in such a way, it's fully accepted, and often pleases the mother (or ESPECIALLY grandmothers that are present with the child). Whereas if a man smiles at a baby or child, or even tries to make an assisting comment to a child who is confused about something or lost, then he is often viewed as a possible threat and gaurded against. Even mothers who act friendly toward such men almost imperceptably go into protection mode and watch him closely. Personally I'm not bothered by the inability to interact with children because I'm really not fond of them at all, but someone who DID like to interact with them would be able to do so if female, and would run into roadblocks or even cause confrontations as a male.There's nothing I can do as a man that I couldn't have done as a woman - except be myself.
That's just ONE of the many examples, but there's no denying that life is very different for someone who is male vs. someone who is female... even if the two individuals had almost identical beliefs, ideals, likes/dislikes etc. Everything about our lives depends not only on ourselves but every single person around us as well. Just like you might run in a straight line through an empty field, but be forced to zigzag if there are random cows around.. you also might continue with a behaviour as a female or male, while being stopped or redirected as the other.
