What if you have a lot of breast tenderness but also I’ve never had my period just to say

Okay so breast tenderness can totally be a sign that puberty is happening, even if your period hasn't started yet.

Your body is changing a lot, and those changes don't all happen at the same time and in the same order for everyone. Breast tenderness is usually one of the first signs of puberty for a lot of girls, and it means your breasts are growing and developing. This is literally just your body getting ready for all the period stuff later, so it's a totally normal thing to feel even without your period.

So yeah, it can ache a little or feel sensitive, especially when you run or if you bump them. It's just part of your breasts growing, and it will probably come and go. If it's really bothering you, you can try wearing a comfy sports bra or a soft bralette to give them some support.