I just purchased my very 1st pair of crocs. 20% off at Hallmark w/coupon. Here's my question, are they suppose to be tight? I tried them on in the store and they were very comfortable, I bring them home they hurt. Do I need a bigger size? I purchased a small, I am size 7 1/2- 8 (depeding on the shoe) Should I get the medium? I really like them, I got them in fuschia. DD6 has a pair and she won't take them off. Do I have to wear them in? All my friends here a DIS swear by them and I value your judgement. That is why I come to you for help. THANKS !!!