I believe that there is life on other planets but it would cost way to much money right now to try and make contact. Along with it being too expensive, we are not advanced enough with our technology or our defences to try and make contact as it could lead to an invasion.
The universe is an infinitely big place to ever assume that there is no life anywhere else. To reach all those places to explore, however, is prohibitive on both financial and technological grounds. There is neither the money nor the knowledge currently available to pursue the exploration that would have to occur to ever find the definitive answers to this question.