Is being frugal a bad thing?

One of the girls I know says I’m a “cheapass” jokingly because I don’t spend money a lot and it’s okay to let go and spend money on myself sometimes and treat myself. She told me to live a little. I know she didn’t mean that, but it bothered me. One time at the 99 cents store, my purchase total was $1.78 and my other girl pal said, “Wow you’re cheap (my name) lol. So frugal.”
She said I need to live and have fun. You can also have fun without spending money. I’ll try to only spend like $100 a month or $200 and that’s it. I’ve been saving my money for summer since I took summer off.
I don’t wanna end up homeless or in debt. I’m not telling you my amount in my bank account but I have over $3000. That’s my estimate and my friends think I’m frugal and it needs to stop.