You have a lot to do with all of your classes and activities. Most gifted students have more going on than the typical middle school student. It's okay to feel stressed every now and then. Find ways to effectively cope with your stress.
Do you need perfect grades
Impact on your brain
What is stresss
Fight, Flight, or Freeze
There are many ways to relieve stress but it is up to you to experiment to find what might work for you.
You may wish to visit PV's relaxing room at https://bit.ly/PVRelaxingRoom