Maybe becos u have not yet found your guy......and if u r scared of takin a chance.....then there is no solution to it...u have to pull this fear aside and take a chance.....but i would say that lovin someone iis not "takin a chance" if u first know what the guy is like:):)
Its either because youve been hurt before or you just trying to secure your heart before anyone shatters it...or your scared of taking a chance