Having 2nd thoughts about getting remarried?

My fiancee Alexis and i are going to be getting married on July 4th. However I'm having doubts if i really want to marry her. One of them is she used to be a porn star and even though she has told me she is done with me and wants to settle down and start a family she still remains in contact with friends from the industry. I don't want those people around my 6 year old daughter and my relationship with my EX Wife Stacy has been strained as a result of my relationship with Alexis. Alexis also loves to drink and party which she picked up during her days in the adult film industry. This really doesn't sit well with me since i am a recovering alcoholic. I love her but i don't think marrying her would be best for myself or my family. What should i do?