I'm not technically a step mom yet, as I'm not married to him yet but we're engaged so I hope noone is mad at me for posting. 

I have no idea why, but I am seriously struggling with the idea of having a step kid... The idea that he's been married, and had a kid with someone before me is really bothering me lately, and I have no idea why... Logically... I know it's not a big deal and it doesn't make any sense for me to have such an issue with it.