Shall I toss it now?

An unbiased coin is one which, if tossed, the chances of a head coming up is same as that of the tails coming up. Or in other words the probability of getting a head or a tail is equal to half. So should I toss a coin and decide now? But then how will I know if it is an unbiased coin or not. Theory says if we toss an unbiased coin a very large number of times, the number of heads should become equal to the number of tails. Well let me find an unbiased coin first, then I will toss it. Fair enough. And then all the decisions in my life will be so damn easy.