Who am I?

I started looking at all of the prayers that are listed as I thought about everything I am going through.

Which is harder knowing what's wrong and suffering for it, or not knowing what's wrong and still suffering?

Is it harder for that person who knows that they are going to die then it is for me, who doesn't even know what's wrong with my body?

Who am I to stand out and complain? Who am I to say "Woe is me!" when others have lost those they love the most?

Who am I to complain about not being able to serve because my body wont let me help with even the smallest of things when there are people who are simply struggling to get though the next day, the next hour, the next minute?

Does it make me a bad Christian to ask God why? To want to yell and rant and rave at Him for doing this to me?

For having my legs and arms, and now my neck and throat, spasm to the point where i can hardly control my body.
For the constant pain I'm in when I'm not having a spasm attack.

I'm 20 years old and it feels like my body is betraying me, but there are those who are younger and are much worse off then me...

Who do I think I am anyway?