Is it normal i don't vote because politicians are able to lie with impunity?

I feel that politicians are able to defraud voters with empty promises that they have no intention of even attempting to keep without consequence. Given this system I feel it is basically pointless to vote because there is no real way to know what you are voting for. A politician could hold the opposite views of what he claims and yet there is no way to know or punish him for defrauding the people.

I even feel it is a little unethical to be part of such a system as a voter since I would be cooperating in what to me appears to be a corrupt, immoral enterprise that rewards deceit.