Is it rude to skip friend a wedding?

I have this coworker who invited me to her wedding that’s today this afternoon. I’ve known her for a year and she’s been telling me about it since she started last year that I was going to be invited. she's been asking for my address and she mailed out the invitations and constantly asking me did I get mine. I got it and it’s today. I’m really not in the mood to go. I won’t know anyone there besides there and I’m going alone. I can’t be around too much people because I have social anxiety. Plus I just broke up with my boyfriend last night so I’m already stressed.

Is it rude to skip friend a wedding?
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