Do I need a prenuptial agreement to protect the property I already have?

I’m engaged and wondering if I need a prenuptial agreement. I have a 10 year old daughter from a prior relationship. I moved here from Maryland to be with my fiancé and we are getting married in LA. I’m told that California is a community property state and that everything we each own now and anything we purchase together while we are married becomes community property. I’m worried about losing half my assets if we divorce. I want to provide for my daughter and I don’t want the assets I own now to be divided with my fiancé, and my daughter to possibly lose out. Will a prenuptial agreement (does his SEO pick up ‘prenup’) protect my property and can my fiancé and I decide what we do and do not want to include in the community property?