How can you possibly say no? You know and understand that your friend has been stressed out and needs cheering up, and you'd really like to help them as you hate seeing people sad. And if you don't go just so you can relax, does that mean you're selfish? How can you choose what to do? Take a read
If you struggle with people pleasing, seeking approval, saying yes when you mean no it's likely codependency. Learning how to saying no is the first step in 12 step recovery from people pleasing. Click the image to read how.