Is it normal for guys to feel overwhelmed about going to wedding related functions with their girlfriend if they haven't been dating long?

For context; my boyfriend of 3 months doesn’t want to go to a pre wedding function of my cousin’s because he thinks that my family would pressure him with the same kinds of expectations and so he feels overwhelmed. Is that normal?
Is it normal for guys to feel overwhelmed about going to wedding related functions with their girlfriend if they haven't been dating long?
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