My breasts are hurting when I touch them

What is wrong with me?

More information: I’m nervous most of the time and tired because of school and all testes that we have, I’m 15 years old, I work out in fitness at least 2 a week and I’m expecting period probably this week

I think these information will help you more to tell me what you think about what’s wrong.

You can ask me more questions about me if you want🤗