Why is my left hand locking up?

I write with my left hand, but why can't i do most activities with it?

• As i said above am left handed, but i cant do most activities with it. I have better control with my right hand, and my right hand is more powerful. When i play tennis i use my right hand, or when i throw a rugby ball or something i use my right hand. And the strange thing is even if i have better control over my right hand, i cant write with it. Most people if they write with their left or right hand, they use the same side to kick a football or a soccer ball as some people call it. I'm left handed, you expect me to kick a ball with my left foot, but instead i use my right foot, because i have better control, and it's more powerful. So am basically just wondering. why I write with my left hand, but cant do a lot of stuff with it. Also how come i'm not left footed. Is their an explanation, or is just simply everyone is born different?

• Answer:

  Do you masturbate with it? That's all that's important really :L Don't worry dude, it's normal, I play golf right handed, guitar right handed and do pretty much everything else right handed, I even use the computer right handed. Do you play video games a lot? That might be the reason, is because you're constantly only ever using your right hand for the mouse and WASD is controlled by your left.