Okay, first off, you can’t trust online or a simple test to diagnose you. Only a doctor can diagnose you. So for right now, you could have depression, alright?
It’s best to tell a trusted adult (that could be a school counselor or someone like that too) and say all your symptoms. The next time you have a doctor appointment, you should ask the doctor.
You really need to tell someone though, that is the first step to helping with everything!