What are the chances of a 23yo female gettin breast cancer?

Small: It is uncommon to get breast cancer in your 20's and if you do it is almost always because of one of the genetic mutations such as BRCA.

Less than 1 in 200: Risk of breast cancer increases with age. The life time risk for all women in the US is 1 in 8. I couldn't find a risk statistic for women under 30. In a 30 year woman the risk was 1 in 227. Unless you have other risk factors that substantially increase your risk, you are unlikely to have breast cancer at age 23.

Extremely Low: Unless you have something called BRCA 1 or 2, or have another CA genetic issue, the chances are extremely remote. Still see your GYN for examination especially if you feel a lump.