I've been in love w/ a girl but I think she never feel the same to me.
Sometimes I ask myself on how to make the girl like me too.
I always say my fellings to her but she don't believes in me,
She always say that "oh,you're joking"..

You cannot MAKE someone do anything they are not already considering.

You can't make someone like you, so leave her alone, and find some one who will.

It has to happen naturally. Though you can't force her to like you, what you can do is put yourself in a position where you can get to know her better and for her to get to know you better.

Once she gets to know you better, she will be in a better position to see if she has feelings for you.