Will I be taken seriously as a stepdad?

The kids are 2 and 10 from two different fathers. Me and their mother have gotten very serious and have been talking about marriage. I just see things that kind of scare me. For example she just got family photos and didn’t even ask me to be in them. I just feel a little like an outsider. Does it get better?
Will I be taken seriously as a stepdad?
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