Are you wearing your cycling shorts? If the seats are too wide & squishy (so true) - maybe try regular shorts?
I spin in regular shorts & my 15 year old cycling shoes which are totally beat up, but the cleats are fairly new. I save my Sidi's for the road. I think some people look down on my shoes (this is Bally's - where you can pick up iron or you can pick up a honey) but at the end of the class, I'm one of the few with a big puddle of sweat all around the bike.
As an aside, we have one instructor (male) who is gay. (I love gay men). He'll say things like, "Your going to hate me after this class...but you'll get over it (giggle)". He's my favorite instructor because he makes us WORK. The instructor can make or break the class.