Dear Melting Rose,
Just wondering if the instructor knew this was your first class...usually they will ask if there is anyone new and help you adjust your bike and tell you to go at your own pace at first. I like to introduce myself as a newbie to the instructor so they don't yell at me
when I do something wrong or go at my own pace
. My butt was very sore the first few times but you do get used to it. The main question is (despite the soreness and the feeling that you couldn't do everything) did you enjoy it? It will definitely take some time to get used to it but the main thing is to have fun. I noticed at my gym people either love spinning or hate it...so give it a few more chances but if you don't like it, maybe there is another type of class you enjoy. Good luck to you.