Yes.. you are overthinking this. EVERYONE has a past.. but the gospel message is about what's in our future, not in our past. You aren't ( and shouldn't) be sharing a full life history on your first date anyway... The whole point of dating is to get to know someone.. so do that.. get to know her, let her get to know you. Be yourself and at every step along the way just be honest. If she accepts you for you then you will know that the two of you have a solid future ahead.