Crying/Getting mad at everything.

I don't really know what's wrong with me. I don't have or had any problem in my life but beginning of my second semester of 9th grade i've been getting mad and depressed consistently. For example, if my friend makes a joke I just want to punch them in the face or even if someone looks at me I get super mad inside myself. I do workout. I do gymnastics and weightlifting. I don't know if it's my body fat percentage or what. Please help.

Thank You everyone!