Does anyone else get excluded at work?

I’m 1 of 5 in a female team. Team will arrange lunches together in and outside work setting. I don’t get invited. I use to get birthday invites outside of work but have since stopped. Man do they also love happy hours but then complain about having no money. I don’t attend because I’m on a budget and one drink is price of a meal nowadays. I rather save the money. One girl went to extreme of having a work colleague baby shower but then had an intimate friend’s baby shower in which another girl from another department was invited. It was obvious I was the only one not invited from the team. Boss will arrange team lunches for special occasions but now I just feel out of place. Am I being petty?

THANK YOU all for the comments and allowing me a space to express what I was feeling. It helped getting this off my chest!