HELP!! Every time I try to lunge my horse he immediately starts to crowd me and then turns his butt at me threatening to kick me OR he gallops away bucking and drags me along with him. And every time he is NOT SADDLED UP so its not like the saddle is bothering him. he is super sweet but this behavior makes me not want to work with him. if you have any good advice for me that would really help me out, Thanks 