Leash & Other Stuff; A bit stuck & need some help.

Hi! I have surfing for year, started on a 9'2" bic, which was fun. Got a bit cocky and dropped down to a 7'6" malibu custom. Can catch it quite easy some days, and on others find it stpidly difficult. Have I jumped too soon? Also te lease gets rapped up around me constantly is it too long? Can i cut it? I also cannot no matter how hard I try sit on my god damn board........please help? I am 6'1" and 14.5 Stone (of muscle, for the ladies). What would you recomend?