My buddy got pulled over for havin one of those in his car, and I think the charges stuck. I dont remember the details, but either way, it goes to show that you can get yourself in trouble with those. It might not be lethal, but I could see how people would think they're dangerous.
I live with 10 people and we all have airsoft guns (AKs, Shotguns, Handguns) and our house fuckin crazy. There's hundreds of thousands of those bbs all over the house.
But just wait till you're 21 and get a handgun. No reason to be packing an airgun...its more trouble than its worth and it will NEVER help you in a practical situation.
And if you are 21, you can get a James Bond style .22 handgun for like $50. Its not the most lethal thing in the world, but its good for plinking frogs.