Is it normal that my parents are always picking on me?

Your moms a bully and it's not normal. A friend once told me that when people throw dirt at you they are loosing ground. All you have to do is shake the dirt off and pack it under your feet. The more dirt they throw the higher you go and rise well above them and the situation.

You can't change it. you just need to find good positive renforcment from someone may it be a friend or even some sort of a guidance counslor therapy. you know. and it seems their just teasing but i would hate my parents doing that to me too

Not right. But earlier you said it was just your mom...so is it your mother or both parents?

that's not very nice and not very constructive of your parents. It happened to me, too. Somehow in my family I got the reputation as "the clumsy one". No one else ever said this to me since, but to this day they probably wouldn't trust me to carry a fragile item. Some families can really undermine your confidence. Try not to let it get to you!