Well I can understand it being a challange for a beginer (Newb) starting bar cords because cause there using muscles the haven't used before therefore having little strength/grip and might be found quite difficult. Through practice it will get better (just like anything) but also you tend to find beginers have there thumb in the wrong place and things like that so you should try correct bad habbits before it gets too late. Also, with alot of people, it the quallity of the practice were they falt and not how much they do. So practive with easy barr chords like minors and use them higher up so it should be easyer to hold.