bouncing mix volume low..please help

ok, so let me admit im new to this program and studio use. i used to own a pc where i used cool edit and fruity loops for my beats. all i had to do was create a mix down and there it was...all ready to go. But with logic pro 8...when i bounce its almost like im bouncing it at a low volume or something. when i play my arrangement in the arrangement window...it sounds fine. but when i bounce it....lets say my volume is 1 to 10...10 being the highest...and its set on level 6...the song will sound like its on level 1 with a bunch of air overtaking the song. i have no clue what to do...please help...thanks