I do not think you are being selfish at all. We decided at the last minute to stay a couple of days longer then we got a big snow storm in NJ so we moved resorts because we needed time for just the two of us. If you stay be prepared to not get any alone time the day after out wedding we had 2 sets of dinner reservations with 2 groups my DH and I wanted a quite dinner but were told you decided to have a dw and eveyone wants to spend time with you. We did not mind but switching resorts really felt like a honeymoon.