I just started rideing about two weeks ago and am only rideind 15 mi. a day. My question is this is it allright to whear mnt bike shorts for road biking? I am about 5'8" 180 lbs. and the only 6 pack I have is in the fridg. I don't want to look like a fat man in a speedo but my butt is realy getting sore. Please help.