no experience with dynastar boards. but they make ok skis I've heard.
the board is the right size for you for freeride so no problem there.
you would definitely benefit from some of the newer snowboard designs.
but theres is nothing wrong with that deck, if cash is a problem keep it and rip it.
if cash isn't a problem might want to get something new.
Dude, suckin at somethin' is just the first step to bein' sorta good at somethin'