Am I being selfish for not wanting to hangout with my friends for a while due to finances?

Pretty much these guys wanted to hang out which I don't mind doing since I know them since high school but every time I do end up hanging out I end up spending 200 plus dollars.

I'm not saying I don't have the money but I want to save it now and start investing in stocks and savings accounts instead of spending it on dumb stuff.
Am I being selfish for not wanting to hangout with my friends for a while due to finances?
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