nothing I draw looks good anymore

Aaaasgh, this is so frustrating, its like all my drawings are shit, why is this so hard, when drawing full body, the poses just look stiff, how do people get there poses to look so dynamic, aaaaaagh, this is so frustrating, and besides that my drawings now just aren't good, I don't know, they just aren't good, and i can't finish any drawings, Anyways here is a drawing I did recently