major cold feet

i am getting married (end of april) to my boyfriend of 4 and half years. i have been in the process of moving in with him. but i am totally freaking out. what if he is not the right guy for me. over the years i do realize that we have many many personality mismatches. he is a neat freak. i am .... not so neat. he is a gym freak, i HATE gym. he is honest freak. i am like every other girl don't think white lies are lies. oh god. we already sent out the invitations. what should i do? someone help me! what if we fight all the time once i officialy move in (i am moving in tomorrow)i don't even know how to cook rice. what do i do?