What’s wrong with me?

It feels like I have no motivation to try, I love boxing, and literally a month ago, I was happy, every single time I went to the gym. But now I don’t care, I only pretend to go so my mom doesn’t yell at me. And it’s not just boxing either. Like school, I used to be happy to go to school to at least see my friends and now I feel like talking to people is a burden and my grades are slipping. Nothing excites me anymore and I just feel sad or tired all the time.